Chemie Der Erde-Geochemistry最新文献_第3页

Mineral composition, trace element geochemistry and metallogenic processes of the early Cambrian black rock series-hosted Xiajiadian gold‑vanadium deposit, southern Qinling, China 南秦岭下家店金钒矿床早寒武世黑色岩系矿物组成、微量元素地球化学及成矿过程

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-12-01 DOI: 10.1016/j.chemer.2025.126362

Bei Li, Laimin Zhu, Xiao Xiong, Lele Ding, Yuanbo Ma, Shenghao Li, Yang Jiang

Black rock series are significant in economic geology as they harbor abunbant mineral resources and are often spatially associated with several types of ore deposits. The Xiajiadian deposit is a large-scale, unique AuV co-product system within these series, yet its mineralogy and detailed metallogenic mechanisms remain poorly constrained. This study employs an integrated approach, including scanning electron microscopy (SEM), X-ray diffraction (XRD), electron probe micro-analysis (EMPA), and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), to systematically determine the mineral composition, trace element geochemistry, and occurrence modes of Au and V.

The black rock series exhibit a complex mineral assemblage, comprising not only quartz, feldspar, carbonates, and clays but also key ore-related minerals such as barite, roscoelite, anatase, and goethite. Geochemical data reveal significant enrichment of Au, V, Ba, P, and Mo,compared to the upper continental crust. Furthermore, we propose a two-stage metallogenic model: first, a sedimentary/diagenesis and metallogenic stage during which hydrothermal-seawater-microbial interactions led to V enrichment to industrial grades and pre-concentration of Au; subsequently, a tectonic-hydrothermal reformation stage during which pre-enriched Au was remobilized and precipitated to form economic orebodies. Vanadium occurs primarily as V³⁺ in anatase and roscoelite, and in an adsorbed state on goethite and clay minerals. Gold exists predominantly as “invisible gold”, mainly in the form of adsorbed gold (on goethite, illite, kaolinite, and organic matter) and structurally bound Au⁺, with a minor component of nanoparticulate Au⁰. Rare earth element and yttrium (REE + Y) systematics indicate that the ore-forming materials were sourced primarily from the black rock series, which formed in a redox-stratified basin through the mixing of seawater, hydrothermal fluids, and microbial interactions. This two-stage genetic model elucidates the coupled enrichment and differential mobilization of Au and V, providing critical insights for regional exploration.

黑色岩系蕴藏着丰富的矿产资源，在空间上往往与多种类型的矿床相关联，在经济地质学中具有重要意义。下家店矿床是该系列中规模较大、独特的水下水下副产物系统，但其矿物学和详细的成矿机制尚不清楚。本研究采用扫描电镜（SEM）、x射线衍射（XRD）、电子探针显微分析（EMPA）、激光烧蚀-电感耦合等离子体质谱（LA-ICP-MS）等综合方法，系统测定了金、钒的矿物组成、微量元素地球化学特征和赋有模式。黑色岩系矿物组合复杂，不仅包括石英、长石、碳酸盐、还有粘土，还有关键的矿石相关矿物，如重晶石、榴辉石、锐钛矿和针铁矿。地球化学数据显示，与上地壳相比，Au、V、Ba、P、Mo等元素明显富集。在此基础上，提出了两阶段成矿模式：第一阶段为沉积/成岩成矿阶段，热液-海水-微生物相互作用导致V富集至工业品位和Au预富集；随后进入构造-热液改造阶段，预富集金被重新活化沉淀形成经济矿体。钒主要以V3+形式存在于锐钛矿和云母中，并以吸附态存在于针铁矿和粘土矿物上。金主要以“看不见的金”形式存在，主要以吸附金（在针铁矿、伊利石、高岭石和有机物上）和结构结合金+的形式存在，少量以纳米颗粒的金0存在。稀土元素和钇（REE + Y）系统分析表明，成矿物质主要来源于黑色岩系，形成于氧化还原层状盆地，受海水、热液流体和微生物相互作用的影响。这一两阶段的成因模型阐明了Au和V的耦合富集和差异动员，为区域勘探提供了重要的见解。

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引用次数: 0

Late Mesoarchean crustal reworking/recycling and magma underplating process: Insights from the petrogenesis of 3.0–2.9 Ga potassic granitoids in the Anshan area, North China Craton 中太古代晚期地壳改造/再循环与岩浆底镀过程：来自华北克拉通鞍山地区3.0-2.9 Ga钾质花岗岩成因的启示

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-12-01 DOI: 10.1016/j.chemer.2025.126361

Yufei Xuan , Jin Liu , Zhenghong Liu , Wang Ding , Liqiang Liu

The evolution and differentiation of early continental crust remain a fundamental research frontier, with potassic granitoids providing critical insights into these processes. This study investigates the petrogenesis and tectonic setting of Late Mesoarchean (3.0–2.9 Ga) potassic granitoids in the Anshan area of the North China Craton (NCC) through comprehensive geochronological, geochemical, and zircon Hf-O isotopic analyses. Zircon U-Pb dating reveals the studied Late Mesoarchean potassic granitoids include ca. 2.95 Ga Tiejiashan biotite monzogranitic-quartz monzonitic gneisses and ca. 3.0 Ga Donganshan monzogranitic gneisses.

The Tiejiashan potassic granitoids exhibit high SiO₂ (68.47–75.28 wt%), K₂O (4.32–4.93 wt%) contents, K₂O/Na₂O (1.19–1.53) ratios, low Mg# (23–25) values and strongly negative Eu anomalies (δEu = 0.19–0.31), with metaluminous and ferroan affinities, classifying them as A-type granites. Magmatic zircons yield δ¹⁸O values of+4.66 ‰–+6.10 ‰ and ε_Hf(t) values of −10.61 to −6.34, with T_DM² ages of 4.43–3.99 Ga. The geochemical and Hf-O isotope characteristics suggest that Tiejiashan potassic granitoids originated from partial melting of Eo-Paleoarchean TTGs (3.8–3.3 Ga) under shallow crustal conditions. In contrast, the Donganshan monzogranitic gneisses display higher SiO₂ (75.69–76.14 wt%) and peraluminous signatures, with pronounced LREE-HREE fractionation, moderately negative Eu anomalies (δEu = 0.69–0.80) and unradiogenic Hf isotopes (i.e., ε_Hf(t) values = −0.85–+1.87, T_DM² age = 3.63–3.39 Ga), indicating Donganshan monzogranitic gneisses originated from partial melting of short-residence TTGs with garnet and amphibole residues. The emplacement of these potassic granitoids records a crustal recycling process, while primary magmatic fabrics (i.e. L ≫ S, L = S) in the ca. 2.95 Ga Tiejiashan pluton suggest high-temperature plastic flow linked to magma underplating. These findings highlight a Late Mesoarchean crustal reworking/recycling process of NCC, driven by the remelting of ancient crust due to magma underplating associated with mantle upwelling in an extensional setting.

早期大陆地壳的演化和分化仍然是一个基础研究前沿，钾质花岗岩类为这些过程提供了重要的见解。通过对华北克拉通鞍山地区晚中太古代（3.0-2.9 Ga）钾质花岗岩的年代学、地球化学和锆石Hf-O同位素的综合分析，探讨了该地区钾质花岗岩的岩石成因和构造背景。锆石U-Pb测年显示，研究的中太古代晚期钾质花岗岩类包括约2.95 Ga铁家山黑云母二长花岗岩-石英二长花岗岩片麻岩和约3.0 Ga东安山二长花岗岩片麻岩。铁家山钾质花岗岩具有高SiO₂（68.47 ~ 75.28 wt%）、高K₂O （4.32 ~ 4.93 wt%）含量、高K₂O/Na₂O（1.19 ~ 1.53）比值、低Mg#（23 ~ 25）值和强负Eu异常（δEu = 0.19 ~ 0.31），具有铝质和铁质亲缘关系，属a型花岗岩。岩浆锆石δ18O值为+4.66‰~ +6.10‰，εHf(t)值为- 10.61 ~ - 6.34，TDM2年龄为4.43 ~ 3.99 Ga。铁家山钾质花岗岩的地球化学特征和Hf-O同位素特征表明，铁家山钾质花岗岩起源于浅地壳条件下的始古太古代TTGs （3.8 ~ 3.3 Ga）部分熔融。东鞍山二长花岗岩片岩具有较高的sio2 （75.69 ~ 76.14 wt%）和过铝特征，LREE-HREE分异明显，Eu中度负异常（δEu = 0.69 ~ 0.80）和非放射性成因Hf同位素（εHf(t) = - 0.85 ~ +1.87， TDM2年龄= 3.63 ~ 3.39 Ga），表明东鞍山二长花岗岩片岩来源于短停留TTGs与石榴石和角闪洞残留物的部分熔融。这些钾质花岗岩类岩体的侵位记录了地壳的再循环过程，而铁家山约2.95 Ga岩体的原生岩浆组构（L ~ S, L = S）则显示了与岩浆底镀有关的高温塑性流动。这些发现强调了中太古代晚期北中陆块的地壳改造/再循环过程，其驱动因素是伸展背景下地幔上涌导致的岩浆底镀导致古地壳重熔。

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引用次数: 0

Corrigendum to “Geochemistry of Silurian–Carboniferous sedimentary rocks of the Ulaanbaatar terrane, Hangay–Hentey belt, central Mongolia: Provenance, paleoweathering, tectonic setting, and relationship with the neighbouring Tsetserleg terrane” [Geochemistry (volume 73, issue 4) 481–493] 《蒙古中部Hangay-Hentey带乌兰巴托地体志留系-石炭系沉积岩的地球化学：物源、古风化、构造背景及其与邻近的Tsetserleg地体的关系》的勘误[地球化学（73卷，第4期）481-493]

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-12-01 DOI: 10.1016/j.chemer.2025.126358

Narantuya Purevjav , Barry Roser

引用次数: 0

Mineralogy, geochemistry and genesis of newly discovered Sinandede kaolin deposit (Balıkesir, NW Türkiye): Potential applications 新发现的Sinandede高岭土矿床（Balıkesir, NW t<s:1> rkiye）的矿物学、地球化学及成因：潜在应用

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-11-30 DOI: 10.1016/j.chemer.2025.126364

Fazlı Çoban , Şenel Özdamar , Oral Sarıkaya , Gökhan Büyükkahraman , Zeynep Döner , Naşide Merve Sütçü

This paper presents first X-ray diffraction (XRD), scanning electron microscopy (SEM), bulk-rock geochemical analyses, isotopic (O-H-C) and differential thermal analysis-thermogravimetric (DTA-TG), physical and thermal tests of Sinandede kaolin deposit (SKD) formed by hydrothermal alteration of Lower Miocene dacitic-rhyodacitic tuffs. The mineralogical analyses revealed that the SKD comprises mainly kaolinite with dickite, illite, smectite-chlorite, Ca-montmorillonite, alunite, halloysite, feldspar, quartz, opal CT, hematite and anhydrite. Geochemically, Al₂O₃, H₂O, Sr, S and Zr contents were markedly enriched, while Rb, Cs, U, Y and Ba were depleted compared with the parent rocks. The chondrite-normalized rare earth element (REE) patterns show identical trends characterized by light rare earth element (LREE) enrichment (La/Sm)_CN = 1.96–10.96 and (La/Yb)_CN = 20.51–37.08), heavy rare earth element (HREE) depletion (Gd/Yb)_CN = 1.37–5.62), slightly Eu anomaly (Eu/Eu* <1), and positive Gd anomaly (Gd/Gd* = av.1.06). The δ¹⁸O values of the samples vary between +0.48 ‰ and, −4.96 ‰; δD values vary between −81.05 ‰ and − 89.97 ‰. On the other hand; δ¹³C (VPDB) values ranging between −25.70 ‰ and − 28.83 ‰ (VPDB) in kaolin samples are compatible with the δ¹³C (VPDB) values of hydrothermal waters mixed with meteoric water fed by C3 plants, indicating the contribution of meteoric water in SDK. Small positive Ce and Gd anomalies, which indicates the presence of a hypogene-supergene mix, further support the contribution of meteoric water. The SDK was formed as a result of post-magmatic hydrothermal activities at temperatures above 100 °C and influenced by both hypojene and supergene conditions. Technological tests suggest that the SDK can be used for wall and floor tiles in ceramic industry.

本文首次对下中新世英灰-流纹酸凝灰岩热液蚀变形成的西南德德高岭土矿床（SKD）进行了x射线衍射（XRD）、扫描电镜（SEM）、体岩地球化学分析、同位素（O-H-C）和差热分析-热重（DTA-TG）、物理和热测试。矿物学分析表明，SKD主要由高岭石、硬石、伊利石、蒙脱石、钙蒙脱石、明矾石、高岭石、长石、石英、蛋白石CT、赤铁矿和硬石膏组成。地球化学特征：Al2O3、H2O、Sr、S、Zr含量较母岩明显富集，Rb、Cs、U、Y、Ba含量较母岩明显富集。球粒陨石归一化稀土元素（REE）模式表现为轻稀土元素（LREE）富集（La/Sm）CN = 1.96 ~ 10.96, (La/Yb)CN = 20.51 ~ 37.08)，重稀土元素（HREE）富集（Gd/Yb）CN = 1.37 ~ 5.62)， Eu轻微异常（Eu/Eu* <1）， Gd正异常（Gd/Gd* = av1.06）。样品的δ18O值变化范围为+0.48‰~ - 4.96‰；δD值在−81.05‰~−89.97‰之间变化。另一方面；高岭土样品的δ13C （VPDB）值在- 25.70‰~ - 28.83‰之间，与C3植物补给的大气水混合热液的δ13C （VPDB）值一致，说明大气水对SDK的贡献。较小的正Ce和正Gd异常表明存在下表生混合，进一步支持了大气水的贡献。SDK是在温度超过100℃的岩浆期后热液活动下形成的，受到下第三纪和表生条件的双重影响。技术测试表明，该SDK可用于陶瓷行业的墙地砖。

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引用次数: 0

New geochemical and geochronological findings from the Mesozoic ophiolites and marine rock sequences in the Tauride ribbon continent (southern Turkiye) and implications for the evolution of the Inner - Tauride and Pindos (Greece) seaways within the Mesozoic Neotethys 土耳其南部Tauride带状大陆中生代蛇绿岩和海相岩层序的地球化学和年代学新发现及其对新特提斯中生代内Tauride和Pindos（希腊）海道演化的启示

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-11-22 DOI: 10.1016/j.chemer.2025.126356

Ender Sarifakioglu , Alican Ozturk , Yıldırım Dilek , Bilgehan Yabgu Horasan , Tamara Bayanova , Mustafa Sevin , Muhammed Çoban , Dmitry Elizarov

Ophiolites exposed in the Konya region of south-central Anatolia play an important role in understanding the distribution of Neotethyan suture zones and paleogeography in the eastern Mediterranean region. The Dipsizgöl ophiolites consist mainly of upper mantle peridotites, rare ultramafic cumulates, and microgabbro – diabase dykes that locally crosscut the peridotites. Basaltic rocks of the Dipsizgöl ophiolite and the Huğlu Unit display P-MORB composition affected by subduction-affected melts. The Huğlu Unit developed in a continental back-arc setting within the Tauride ribbon continent during the Middle-Late Triassic through Cretaceous. The Dipsizgöl ophiolite is geochemically similar to the ophiolites derived from the Pindos back-arc basin, which opened between the Dinaride–Hellenide microcontinent and the Pelagonia Platform to the west during the Late Triassic. A diabase dyke from the Dipsizgöl ophiolite revealed a Rb–Sr whole-rock isochron age of 183 ± 69 Ma. Although we take into account the possibility of errors arising from processes within the system or external factors, this data indicates that the oceanic basin existed between the Lower Triassic to the latest Lower Cretaceous. This intra-continental back-arc basin was likely part of the Southern Inner-Tauride Ocean (SITO), which constituted the eastern equivalent of the Mesozoic Pindos ocean farther west. The Hatip-Çağırbağı, Yükselen, Yunak, Çeşmelisebil and Altınekin ophiolites in the Anatolides exhibit geochemical characteristics of back-arc to fore-arc environments, and represent the remnants of the Mesozoic Northern Inner-Tauride Ocean (NITO). The UPb zircon dating of a shoshonitic mafic dyke that crosscuts the Altinekin ophiolitic mélange revealed a 70–85 Ma crystallization age, which is interpreted as the timing of the development of an immature volcanic arc. With the opening of the Neotethys in the late Permian, the Apulian microcontinent, which comprised the Dinaride–Hellenide–Tauride carbonate platforms, broke away from the Gondwana continent and drifted northwards. The Pindos basin was a separate seaway in Neotethys and opened within the Apulian microcontinent in the early? Triassic and closed in the Late Cretaceous–Early Paleocene.

安纳托利亚中南部科尼亚地区出露的蛇绿岩对了解地中海东部地区新特提斯缝合带的分布和古地理具有重要意义。Dipsizgöl蛇绿岩主要由上地幔橄榄岩、罕见的超镁铁质堆积和局部横切橄榄岩的微辉长岩辉绿岩脉组成。Dipsizgöl蛇绿岩和Huğlu单元玄武岩的P-MORB组成受俯冲影响的熔体影响。Huğlu单元发育于中晚三叠世至白垩纪的金牛带大陆弧后环境中。Dipsizgöl蛇绿岩与Pindos弧后盆地蛇绿岩地球化学特征相似，该盆地位于Dinaride-Hellenide微大陆和Pelagonia台地之间，于晚三叠世向西打开。Dipsizgöl蛇绿岩辉绿岩脉的Rb-Sr全岩等时年龄为183±69 Ma。尽管我们考虑了系统内部过程或外部因素的误差，但这些数据表明，在下三叠统至下白垩统晚期之间存在海洋盆地。该大陆弧后盆地可能是南内牛头海（SITO）的一部分，南内牛头海在东部相当于更远的西部中生代品多斯海。Anatolides中的Hatip-Çağırbağı、y kselen、Yunak、Çeşmelisebil和Altınekin蛇绿岩具有弧后-弧前环境的地球化学特征，代表了中生代北内牛系海洋（NITO）的残余。对横切阿尔金蛇绿岩脉的闪玄岩基性岩脉进行了UPb锆石定年，结果显示结晶年龄为70 ~ 85 Ma，为未成熟火山弧发育的时期。随着二叠纪晚期新特提斯的打开，由Dinaride-Hellenide-Tauride碳酸盐岩台地组成的阿普利亚微大陆与冈瓦纳大陆分离并向北漂移。品多斯盆地是尼特提斯的一个独立的海道，并于公元80年代早期在阿普利亚微大陆内开放。三叠纪，晚白垩世-早古新世闭合。

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引用次数: 0

The multi-stages Sn mineralization process in the Xianghualing orefield: Constraints from cassiterite and vesuvianite UPb geochronology 香花岭矿田多期次锡成矿过程：锡石和维苏岩UPb年代学的制约

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-11-19 DOI: 10.1016/j.chemer.2025.126360

Zhang Dexian , Zhou Jialing , Fang Ruize , Xiao Dian , Hu Ziqi

The Nanling WSn belt, a world-class metallogenic province, hosts multi-stages WSn mineralization, accurately constraining the evolutionary history of these polymetallic deposits is essential for understanding mineralization processes and building up their metallogenic models. The Xianghualing orefield, a significant Sn-polymetallic district within the Nanling WSn belt, displays notable multistage Sn mineralization. Cassiterite UPb geochronology on sulfide-type cassiterite ores from the Xinfeng mining area, skarn-type Sn ores from the Tangguanpu mining area, and F1 fault-controlled sulfide-type cassiterite ores in the Xianghualing orefield were involved in this study. The obtained cassiterite UPb ages are 147.8 ± 1.2 Ma, 145.2 ± 2.8 Ma, and 141 ± 23 Ma, respectively, while a vesuvianite dating result yields 154.7 ± 1.9 Ma. These ages are consistent with previously reported cassiterite UPb dates from the Tieshaping deposit within the orefield and the Xitian deposit in the northern part of the orefield, extending the temporal frame-work of the Xianghualing Sn mineralization and the southern Hunan Sn-polymetallic mineralization system into the Early Cretaceous. Combined with previous studies on magmatic-hydrothermal fluids associated with Sn mineralization in southern Hunan, we propose that highly evolved Cretaceous granites represent prime exploration targets for Sn deposits in this region.

南岭WSn带是世界级的WSn成矿大省，具有多期次的WSn成矿作用，准确地控制这些多金属矿床的演化历史，对于认识成矿过程和建立其成矿模式至关重要。湘华岭矿田是南岭WSn带内一个重要的锡多金属矿带，具有明显的多期成矿特征。本文对新丰矿区硫化物型锡石矿石、唐官堡矿区矽卡岩型锡石矿石和香花岭矿田F1型断控硫化物型锡石矿石进行了UPb年代学研究。锡石的UPb年龄分别为147.8±1.2 Ma、145.2±2.8 Ma和141±23 Ma，而维苏岩的UPb年龄为154.7±1.9 Ma。这些年龄与矿田内铁沙坪矿床和矿田北部西田矿床的锡石UPb年龄一致，将湘花岭锡矿化和湘南锡多金属成矿体系的时间格架延长至早白垩世。结合前人对湘南地区锡成矿相关岩浆热液流体的研究，认为高度演化的白垩系花岗岩是该区锡矿床的主要找矿目标。

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引用次数: 0

Geochemical evolution of geothermal waters in Trans-Himalayas: Implications for critical mineral deposition 跨喜马拉雅地热水地球化学演化：对关键矿物沉积的启示

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-11-12 DOI: 10.1016/j.chemer.2025.126348

Archisman Dutta , Parashar Mishra , Abhijit Mukherjee , Vivek P. Malviya , Sanjeet Kumar Verma , P.K. Singh , Biswajit Ray

The hydrothermal fluids of the Trans-Himalayan region host rich deposits of critical elements (e.g. Li, Cs, B, W, etc.), that forms critical energy minerals. We characterize geochemical evolution of hydrothermal waters in Trans-Himalayan region, delineating the origin and dissemination of critical energy minerals as epithermal deposits in the region. Thermal fluids exhibit enrichment in W with maximum value of 1603 μg/L and rare alkalis like Cs and Li, whose peak concentrations reach upto 6976 μg/L, and 6.8 mg/L, respectively. Similarly, soils/altered rocks are characterized by significant levels of Li (116–911 mg/kg), Cs (632.56–3317 mg/kg), Cu (181–343 mg/kg), Hg (11–2540 μg/kg), Sb (108.94–6602 mg/kg), BaSO₄ (27.49–71.13 %), S (37.3 %), and F (84–3848 mg/kg). This study identifies Li-bearing mica minerals in considerable concentrations, alongside epithermal minerals attributing to a paleo-high-temperature regime in the Himalayan geothermal field. A conceptual model has been developed to trace the origin of critical minerals in thermal fluids and spring deposits, suggesting that metals and metalloids degas from felsic magmatic melts, through less-denser geological vapours, primarily as vapour-soluble chloride and sulfide complexes, which mixes with genetically evolved secondary fluids undergoing gas-solution-rock interactions and gets enriched in liquid phase after steam segregation, mainly due to decompression boiling.

跨喜马拉雅地区热液中蕴藏着丰富的关键元素（如Li、Cs、B、W等），形成关键的能量矿物。本文描述了跨喜马拉雅地区热液水的地球化学演化特征，描绘了该地区关键能源矿物作为浅成热液矿床的起源和传播。热流体富集W，最大富集量为1603 μg/L；富集稀有碱Cs和Li，最大富集量分别达到6976 μg/L和6.8 mg/L。同样，土壤/蚀变岩中Li （116 ~ 911 mg/kg）、Cs （632.56 ~ 3317 mg/kg）、Cu （181 ~ 343 mg/kg）、Hg （11 ~ 2540 mg/kg）、Sb （108.94 ~ 6602 mg/kg）、BaSO4（27.49 ~ 71.13%）、S（37.3%）和F （84 ~ 3848 mg/kg）含量显著。本研究在喜马拉雅地热田中发现了大量含锂云母矿物，以及归因于古高温状态的浅成热液矿物。在热流体和温泉矿床中建立了一个追踪关键矿物起源的概念模型，表明金属和类金属从长英质岩浆熔体中脱气，通过密度较小的地质蒸汽，主要作为气溶性氯化物和硫化物络合物，与经过气-溶-岩相互作用的遗传进化的二次流体混合，并在蒸汽分离后在液相中富集，主要是由于减压沸腾。

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引用次数: 0

Early Cretaceous volcanism and correlation with large-scale Au mineralization in the Jiaolai basin, Jiaodong Peninsula: Evidences of geochronology and geochemistry from the Qingshan Group 胶东半岛胶来盆地早白垩世火山作用及其与大规模金矿化的对比：来自青山群的年代学和地球化学证据

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-11-10 DOI: 10.1016/j.chemer.2025.126345

Long Zhang , Dong Li , Juquan Zhang , Yongkui Wang , Ning Xu , Junfeng Li

On the western margin of the Jiaolai Basin (JLB), acidic volcanic rocks in the Shiqianzhuang Formation of the Qingshan Group are exposed to the eastern part of the Tan-lu fault zone. Bulk element analyses reveal that the rare earth element (REE) distribution pattern exhibits enrichment in light REEs, depletion in heavy REEs and are enriched in high field strength elements (HFSEs) and depleted in large ion lithophile elements (LILEs). The δEu values indicate negative Eu anomalies. The LA–ICP–MS zircon UPb ages are 109 ± 1.8 Ma, 115 ± 1.6 Ma and 126 ± 1 Ma, respectively, which are consistent with the range of gold mineralization in Jiaodong Peninsula (JEP). Comparison with the widespread mafic-intermediate-felsic dikes and the regional tectonic evolution of Tan-lu fault, it is concluded that the episodic developments of lithospheric thinning are in accordance with the extensive gold mineralization in the JEP during the Early Cretaceous. The acidic volcanic rocks documented that the JLB evolved from prototype into a volcanic basin, meanwhile, large-scale gold mineralization formed along the secondary branches of the Tan-lu fault in the Early Cretaceous, due to the combined effects of changes in the subduction angle of the Paleo-Pacific Plate, trench migration and changes in the subduction direction.

在胶莱盆地西缘，郯庐断裂带东段暴露出青山群石千庄组酸性火山岩。体元素分析表明，稀土元素（REE）的分布模式表现为轻稀土富集，重稀土亏缺，富集于高场强元素（hfse），亏缺于大离子亲石元素（LILEs）。δEu值显示负Eu异常。LA-ICP-MS锆石UPb年龄分别为109±1.8 Ma、115±1.6 Ma和126±1 Ma，与胶东半岛金矿化范围一致。通过与广泛分布的基性-中长英质岩脉及郯庐断裂的区域构造演化对比，认为岩石圈减薄的幕式发展与早白垩世JEP广泛的金矿化相一致。酸性火山岩表明，早白垩世，在古太平洋板块俯冲角度变化、海沟迁移和俯冲方向变化的综合作用下，沿郯庐断裂次级分支形成了大规模的金矿化。

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引用次数: 0

Ediacaran and early-palaeozoic bimodal volcanism in the Ossa-Morena Zone, SW Iberian Massif: New clues for intraplate rifting shortly after the Cadomian Orogeny 伊比利亚西南地块Ossa-Morena带埃迪卡拉纪和早古生代双峰火山作用：卡多明造山运动后短时间内板内裂陷的新线索

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-11-09 DOI: 10.1016/j.chemer.2025.126351

P. Cachapuz , M. Chichorro , T. Bento dos Santos , D.R. Carvalho , U. Linnemann , M. Zieger-Hofmann , J. Zieger , E. Dantas , R.V. Santos , P. Moita , M. Beltrame , A.R. Solá , M. Díaz-Azpíroz , C. Fernández

This study focuses on bimodal meta-volcanic rocks present in the Iberian Massif, in the Évora-Aracena Metamorphic Belt of the Ossa-Morena Zone (OMZ), near the boundary with the South Portuguese Zone. New petrological, geochemical (whole-rock and SrNd isotopes) and LA-ICP-MS UPb zircon geochronology data are presented to track the magmatic evolution of both felsic and mafic rocks and their respective geodynamic setting during the transition between the Cadomian Orogeny and subsequent Palaeozoic rifting events.

Our research shows that the Évora-Aracena Metamorphic Belt (EAMB) in the southwestern OMZ possesses a significant record of the transition between the Cadomian and Variscan cycles. UPb geochronological data confirm the existence of both felsic and mafic Ediacaran igneous rocks (546 and 556 Ma, respectively), a novelty in the region. The Cadomian-related felsic rocks show geochemical similarities to meta-felsic rocks formed during the initial phases of the Cambrian rifting event, namely very negative εNd values (−10.1 to −11.8), depleted HREE patterns and orogenic signatures. Such similarities imply that meta-felsic rocks formed in the earliest stages of the Cambrian Rift-to-Drift event resulted from a shallower melting.

Moreover, meta-felsic rocks formed in the early stages of the Cambrian rifting (525 Ma) present a significant amount of Ediacaran aged zircons, whereas the Cadomian-related counterparts display a few discordant Cambrian ages, likely a consequence of Pb-loss. This indicates that the convergent, subduction-related regime that prevailed during most of the Cryogenian-Ediacaran times along the boundaries of NW Gondwana was swiftly supplanted by a rift-dominated regime during the Cambrian, with no substantial gap between these two thermal events. Meanwhile, meta-felsic rocks formed during the Rift-to-Drift (525–480 Ma) event exhibit progressively higher εNd values (−5.0 to +3.0), HREE-enrichment, as well as anorogenic signatures, denoting an increasing contribution of mantle-derived melts. This increasing mantle contribution eventually led to the occurrence of bimodal magmatism in the Middle Cambrian Main Rift event. Such Cambrian mafic rocks, unlike the Ediacaran mafic rocks that present flat REE patterns and continental arc signatures, display varying degrees of LREE enrichment and N-MORB to E-MORB signatures.

本研究的重点是在靠近南葡萄牙带边界的Ossa-Morena带（OMZ） Évora-Aracena变质带伊比利亚地块的双峰变质火山岩。本文提出了新的岩石学、地球化学（全岩和SrNd同位素）和LA-ICP-MS UPb锆石年代学资料，以追踪卡多米期造山和随后的古生代裂陷事件过渡期间长英质岩和基性岩的岩浆演化及其各自的地球动力学背景。研究表明，鄂尔多斯西南方的Évora-Aracena变质带（EAMB）具有Cadomian旋回与Variscan旋回交替的重要记录。UPb地质年代学数据证实了长英质和基性埃迪卡拉纪火成岩（分别为546和556 Ma）的存在，这是该地区的一个新发现。卡多米系长英质岩石与寒武纪裂陷事件初期形成的变质长英质岩石在地球化学上具有非常负的εNd值（−10.1 ~−11.8）、贫稀土模式和造山特征。这种相似性表明，寒武纪裂谷-漂移事件早期形成的变质长英质岩石是由较浅的融化造成的。此外，在寒武纪裂陷早期（525 Ma）形成的变质长英质岩石中存在大量埃迪卡拉纪年龄的锆石，而与卡多米亚纪相关的变质长英质岩石则显示出少量寒武纪年龄不一致的锆石，这可能是铅损失的结果。这表明在寒武纪-埃迪卡拉纪沿西北冈瓦纳边界的大部分时期盛行的与俯冲有关的会聚机制在寒武纪迅速被裂谷主导的机制所取代，这两个热事件之间没有实质性的间隙。裂谷-漂移（525 ~ 480 Ma）变质长英质岩石的εNd值逐渐升高（- 5.0 ~ +3.0），ree富集，并表现出造山特征，表明幔源熔体的贡献不断增加。这种地幔贡献的增加最终导致了中寒武纪主裂谷事件中双峰岩浆活动的发生。寒武纪基性岩与埃迪卡拉系基性岩不同，表现出不同程度的LREE富集和N-MORB ~ E-MORB特征。

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Geochemistry and petrogenesis of the Early Paleozoic Guangning granitic pluton in the Yunkai Massif, South China: Insights into magma evolution and tectonic setting 云开地块早古生代广宁花岗质岩体地球化学与岩石成因：岩浆演化与构造背景

IF 2.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Chemie Der Erde-Geochemistry

Pub Date : 2025-11-07 DOI: 10.1016/j.chemer.2025.126349

Zhihao Sun , Huan Li , Yuxuan Huang , Thomas J. Algeo , Wei Quan , Tao Xiao , Buqing Wang , Wenbo Sun , Weidong Ren

The Guangning area of the Yunkai Massif is rich in mineral resources and extensively intruded by granites that played a crucial role in the ore mineralization process. However, the high-precision geochronology and isotopic geochemistry of these granites remain understudied. This study presents the first detailed geochronological and geochemical characterization of Early Paleozoic granites from the Guangning area of the Yunkai Massif, South China Craton (SCC). Our results address a significant knowledge gap with regard to the magmatic history of this region and provide crucial geological evidence elucidating the Early Paleozoic tectonic evolution of the SCC. Via LA-ICP-MS UPb zircon geochronology, our study constrains the emplacement age of the Early Paleozoic Guangning granitic pluton to between 452.3 ± 1.3 Ma and 448.5 ± 1.6 Ma. Integrating these results with previous studies, we identify a prominent magmatic event in the Yunkai Massif during the Late Ordovician (~458–444 Ma). The Guangning granites display geochemical signatures typical of the high‑potassium calc-alkaline series and possess strong peraluminous affinities. These rocks are characterized by high SiO₂ (71.1–77.9 wt%) and Al₂O₃ (10.3–14.5 wt%) and low MgO (0.03–0.90 wt%), CaO (0–1.42 wt%), and total FeO contents (0.58–1.89 wt%). The samples show enrichment in high-field-strength elements and Pb, and depletion in Nb, Ce, P, and large-ion lithophile elements. The rare earth element (REE) patterns indicate significant fractionation, with enrichment in light REEs (LREEs) and negative Eu anomalies. The whole-rock εNd(t) values of the Guangning granites range from −9.8 to −8.7 with notable negative f_Sm/Nd anomalies (−0.4 to −0.3), and two-stage Nd model ages (T_DM2) of ~1614–1528 Ma. The zircon εHf(t) values mostly range from −5.5 to −0.5, and the initial (¹⁷⁶Hf/¹⁷⁷Hf)_i values are concentrated in the range of 0.28234 to 0.28248, with the two-stage depleted mantle model ages (T_DM2) of ~1783–1468 Ma. These characteristics are typical of strongly peraluminous S-type granites, likely derived from mica dehydration melting at low temperatures of aluminous pelitic rocks in the Paleoproterozoic–Mesoproterozoic crust of the Cathaysia Block, and having undergone fractional crystallization episodes characterized by the involvement of plagioclase, K-feldspar, and biotite. Comprehensive analysis of the regional geological context indicates that the SCC experienced a dynamic shift from orogenic compression to post-orogenic extension at ~450–435 Ma, with the Guangning Early Paleozoic S-type granites forming during this transitional period.

云凯地块广宁地区矿产资源丰富，花岗岩广泛侵入，在成矿过程中起着至关重要的作用。然而，这些花岗岩的高精度年代学和同位素地球化学研究仍然不足。本文首次详细介绍了华南克拉通云开地块广宁地区早古生代花岗岩的年代学和地球化学特征。我们的研究结果弥补了该地区岩浆历史的重大知识空白，并为阐明早古生代SCC的构造演化提供了重要的地质证据。通过LA-ICP-MS UPb锆石年代学，确定了广宁早古生代花岗岩岩体的侵位年龄在452.3±1.3 Ma ~ 448.5±1.6 Ma之间。结合前人研究结果，确定了晚奥陶世（~458 ~ 444 Ma）云凯地块有一次突出的岩浆活动。广宁花岗岩具有典型的高钾钙碱性系列地球化学特征，并具有较强的过铝亲和力。这些岩石具有高SiO₂（71.1 ~ 77.9 wt%）和Al₂O₃（10.3 ~ 14.5 wt%），低MgO （0.03 ~ 0.90 wt%）、CaO （0 ~ 1.42 wt%）和总FeO含量（0.58 ~ 1.89 wt%）的特征。样品中高场强元素和Pb富集，Nb、Ce、P和大离子亲石元素富集。稀土元素（REE）模式显示出明显的分馏，富集轻稀土（lree）和负Eu异常。广宁花岗岩全岩εNd(t)值在−9.8 ~−8.7之间，fSm/Nd呈负异常（−0.4 ~−0.3），两阶段Nd模式年龄（TDM2）为~1614 ~ 1528 Ma。锆石εHf(t)值大多在−5.5 ~−0.5之间，初始（176Hf/177Hf）i值集中在0.28234 ~ 0.28248之间，两期衰竭地幔模式年龄（TDM2）为~1783 ~ 1468 Ma。这些特征是强过铝质s型花岗岩的典型特征，可能来源于华夏地块古元古代—中元古代地壳中铝质泥质岩石在低温下的云母脱水熔融，并经历了以斜长石、钾长石和黑云母为特征的分晶期。综合区域地质背景分析表明，广宁早古生代s型花岗岩形成于~450 ~ 435 Ma，经历了由造山挤压向造山后伸展的动态转变。

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引用次数: 0