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Newly Identified A-type Granite in Western Yangtze Block and Its Geochemistry Characteristics: Evidence for Ridge Subduction beneath the South China Craton 扬子地块西部新发现的a型花岗岩及其地球化学特征:华南克拉通下脊俯冲的证据
IF 1.5 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-11-27 DOI: 10.1134/S0869591123060024
Awei Mabi, Yanlong Li, Mingchun Zhang, Zhengxi Yang, Niuben Yu

Numerous Neoproterozoic granitic intrusions occur over a north-south distance of more than 700 km in the western Yangtze Block. In this paper, we use zircon U-Pb age, Lu-Hf isotopic, and whole-rock geochemical data to show that the Shimian granitic pluton, which was previously thought to be S-type granite in the area, is actually A-type granite. The selected fresh samples for this study are mainly porphyritic biotite monzogranites. They are weak peraluminous, A2-subtype granites, displaying high contents of SiO2 and K2O, low CaO, and Na2O, with the characteristics of high silica, rich potassium, and low sodium. They are enriched in incompatible trace elements, but low in trace elements compatible in mafic silicates and feldspars, and they are chemically characterized by having high REE and Ga abundances and low Al, Ni, Ba, Sr, and Eu abundances. The major and trace element behavior suggests that the granites underwent the process of advanced fractional crystallization and were likely generated by crustal partial melting. Zircon U-Pb age shows the Shimian granitic pluton was emplaced at 728 ± 20 Ma. The studied granites yield an average 176Hf/177Hf value of 0.282363 (εHf = 0.8) with a 94% confidence interval of 0.282334 to 0.282384 (εHf = −0.1 to 1.7), indicating that they are derived from the remelting of juvenile continental crust. We suggest that this newly identified A-type granite at Shimian, southwestern China, was more plausibly generated in an extensional setting as a result of slab window caused by ridge subduction, which can account not only for the formation of voluminous granitoids, but also for the basalts, boninitic pillow lavas, and SSZ-type ophiolites in western Yangtze Block.

在扬子地块西部,有大量的新元古代花岗质侵入岩,其南北长度超过700公里。本文利用锆石U-Pb年龄、Lu-Hf同位素及全岩地球化学资料,表明该区石绵花岗岩体由原来认为的s型花岗岩体为a型花岗岩体。本研究选取的新鲜样品主要为斑状黑云母二长花岗岩。弱过铝质a2亚型花岗岩,SiO2、K2O含量高,CaO、Na2O含量低,具有高硅、富钾、低钠的特征。富不相容微量元素,富镁基硅酸盐和长石中不相容微量元素,具有REE、Ga丰度高,Al、Ni、Ba、Sr、Eu丰度低的化学特征。主微量元素行为表明,该花岗岩经历了超前的分异结晶过程,可能是由地壳部分熔融形成的。锆石U-Pb年龄显示石冕花岗质岩体侵位时间为728±20 Ma。花岗岩的平均176Hf/177Hf值为0.282363 (εHf = 0.8), 94%的置信区间为0.282334 ~ 0.282384 (εHf = - 0.1 ~ 1.7),表明花岗岩来源于幼年大陆地壳的重熔。本文认为,石绵新发现的a型花岗岩更可能是在隆起俯冲形成的板块窗的拉张背景下形成的,这不仅可以解释大量花岗岩类的形成,也可以解释扬子地块西部玄武岩、珠光枕状熔岩和ssz型蛇绿岩的形成。
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引用次数: 0
Sources of Cuprous Sulfide Mineralization and High-Ni Olivine of the Rudnaya Dyke (Imangda Cluster, Norilsk region): Based on Compositional, Isotope and Model Data Norilsk地区Imangda岩群Rudnaya岩脉铜硫化物矿化与高镍橄榄石来源:基于成分、同位素和模型数据
IF 1.5 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-11-27 DOI: 10.1134/S086959112306005X
V. D. Brovchenko, I. A. Kirillina, M. A. Yudovskaya, G. Costin, I. V. Pshenitsyn, E. V. Kovalchuk, Yu. O. Larionova, Yu. D. Gritsenko, A. A. Ketrov, S. F. Sluzhenikin

The Rudnaya dyke of the Imangda ore cluster is composed of weakly differentiated olivine-bearing to olivine gabbrodolerites with globular and interstitial sulfides of a chalcopyrite–cubanite- (pentlandite-pyrrhotite) composition. Along with sulfide mineralization, gabbrodolerites of the dyke contain xenoliths of hornfelsed basalts, abundant amygdales and rare grains of zoned olivine-1 Fo90–47 that coexists with subhedral olivine Fo74–36 of the second generation. Modeling with the COMAGMAT and alphaMELTS programs showed that high-Mg Ol-1 with Cr-spinel inclusions cannot be crystallized from a Fe-enriched tholeiitic melt with 4.8–7.3 wt % MgO and 11.6–16.7 wt % total Fe2O3 that is parental for the dyke. The variation trend and high Ni up to 0.5 wt % NiO in the cores of xenocrystic olivine Fo90–76 in contrast to maximum Fo83 and 0.4 wt % NiO in olivine from the ore-bearing intrusions and picritic basalts of the Norilsk region point toward the presence of deep-seated cumulates of picritic magmas, which had not exchanged with sulfide liquid. Platinum group element (PGE) abundances increase (up to 2.2 ppm) with increasing Cu/Ni in the whole rocks and proportions of pentlandite in a sulfide association. A specific pattern of chalcophile metal distribution with Ni, Os and Ir minima, elevated Cu/Ni (5–15) and Cu/Pd (3200–10 900) along with lower PGE tenor (PGE content in 100% sulfide) of sulfides (2–65 ppm) and Pd content in pentlandite (<175 ppm) compared to those of the ore-bearing intrusions suggest that cuprous sulfide mineralization was not physically captured from highly fractionated sulfide fractions of ore-bearing magmas but is cogenetic with a magma of the dyke. Sulfide saturation, near-simultaneous with fluid saturation and degassing, was achieved in the dyke conduit due to assimilation of sedimentary sulfur and volatiles from Devonian evaporites that is supported by the heavy S isotope composition of dyke’s sulfides with the average δ34S = 14.7 ±1.1‰ (n = 31) close to the values for sulfides from the endocontact zones of the Imangda ore-bearing intrusions hosted by the Devonian sequences. The initial isotopic characteristics of dyke rocks (Sri 0.70517–0.70532, ɛNd from –0.4 to 0.8) imply its comagmatic origin with the Norilsk-type intrusions whereas the overall data do not exclude its spatial connection with an upper crustal conduit network of the ore-bearing magmas.

Imangda矿群的Rudnaya岩脉由弱分异的含橄榄石-橄榄石辉长岩组成,含黄铜矿-立方铁矿-(粒状-磁黄铁矿)的球状和间隙硫化物。随着硫化物矿化,岩脉辉长岩中含有角化玄武岩包体、丰富的杏仁核和罕见的分带橄榄石-1 Fo90-47,与第二代半面状橄榄石Fo74-36共存。COMAGMAT和alphamelt程序模拟表明,含cr尖晶石包裹体的高mg的Ol-1不能从富铁的拉斑岩熔体中结晶,这些熔体的MgO含量为4.8-7.3 wt %, Fe2O3总量为11.6-16.7 wt %,是岩脉的母体。与诺里斯克地区含矿侵入体和苦荞质玄武岩中最大的Fo83和0.4 wt % NiO相比,Fo90-76的异晶橄榄石岩心Ni含量的变化趋势和高达0.5 wt % NiO的高Ni含量表明苦荞质岩浆存在于深部,未与硫化物液体交换。铂族元素(PGE)丰度随着整个岩石中Cu/Ni的增加和硫化物组合中镍黄铁矿比例的增加而增加(最高可达2.2 ppm)。亲铜金属的特定分布模式(Ni、Os和Ir最小,Cu/Ni(5-15)和Cu/Pd(3200-10 900)升高,硫化物中PGE含量(100%硫化物中PGE含量)(2-65 ppm)和镍黄铁矿中Pd含量(175 ppm)较含矿侵入体低)表明,铜硫化物矿化不是从含矿岩浆的高分异硫化物部分中物理捕获的,而是与岩脉岩浆共成的。岩脉内硫化物的平均δ34S = 14.7±1.1‰(n = 31),接近于泥盆系含矿侵入体内接触带硫化物的δ34S平均值(14.7±1.1‰),在岩脉内蒸发岩中沉积硫和挥发物的同化作用下实现了硫化物的饱和和脱气。脉岩的初始同位素特征(Sri 0.70517-0.70532, ε Nd从-0.4 ~ 0.8)暗示其与norilsk型侵入岩的岩浆成因,但总体数据不排除其与上地壳含矿岩浆管道网络的空间联系。
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引用次数: 0
Metasomatic Transformation of Amphibolites into Corundum-Bearing Plagioclasites: Zoning and Numerical Model of the Process with Reference to the Unique Khitostrov Corundum Deposit, Fennoscandian Shield 闪长岩向含刚玉斜长岩的变质转化:以芬诺斯坎地盾独特的希托斯特罗夫刚玉矿床为参照,对这一过程进行分区并建立数值模型
IF 1.5 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-11-27 DOI: 10.1134/S0869591123060061
S. A. Bushmin, A. B. Kol’tsov, Yu. M. Lebedeva, E. V. Savva

The paper presents results of a study of middle crustal (amphibolite-facies level) desilicated rocks exemplified by corundum-bearing plagioclasites developing after metabasites at the unique Khitostrov corundum deposit in the Belomorian–Lapland orogen of the Fennoscandian shield, with emphasis placed onto newly acquired geological data, documentation and analysis of the metasomatic zoning, determination of the P–T conditions of its formation, and a model of the metasomatic process.

本文介绍了在芬诺斯坎地盾Belomorian-Lapland造山带Khitostrov刚玉矿床中,以变质岩后发育的含刚玉斜碎屑岩为例的中地壳(角闪岩相水平)脱硅岩的研究结果,重点介绍了新获得的地质资料、交代带的记录和分析,确定了其形成的P-T条件,并建立了交代过程模型。
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引用次数: 0
Early Paleozoic Tectonothermal Evolution of the Khan-Khukhay Metamorphic Complex, Northern Mongolia 蒙古北部可汗-呼克哈变质杂岩早古生代构造-热演化
4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-10-01 DOI: 10.1134/s0869591123050041
O. P. Polyansky, A. Yu. Selyatitskii, S. V. Zinoviev, A. V. Babichev
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引用次数: 0
Formation Stages and Conditions of Carbonate–Silicate Veins and Their Wall-Rock Aureoles in the Early Proterozoic Complexes of the Belomorian Mobile Belt, Northern Karelia 北卡累利阿Belomorian活动带早元古代杂岩中碳酸盐-硅酸盐脉体及其围岩光圈的形成阶段与条件
4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-10-01 DOI: 10.1134/s0869591123050077
I. S. Volkov, V. M. Kozlovskii
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引用次数: 0
Microprobe Analysis of Titanium in Zircon: an Estimation of Secondary Fluorescence 锆石中钛的微探针分析:二次荧光的估计
4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-10-01 DOI: 10.1134/s086959112305003x
A. A. Borisov, S. E. Borisovskiy, A. N. Koshlyakova
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引用次数: 0
Updated COMAGMAT-5: Modeling the Effects of Sulfide Precipitation in Parallel to the Crystallization of Alumino-Chromian Spinel 更新COMAGMAT-5:模拟硫化物沉淀对铝铬尖晶石结晶的影响
4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-10-01 DOI: 10.1134/s0869591123050028
A. A. Ariskin, K. A. Bychkov, G. S. Nikolaev, G. S. Barmina
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引用次数: 1
Variations in the Composition of MORB Chilled Glasses from the Mid-Atlantic Ridge, 12°–31° N: Reflection of Compositional Evolution of Parental Melts and the Influence of a Hydrothermal Component 12°-31°N大西洋中脊MORB冷玻璃组分的变化:母熔体组分演化的反映和热液组分的影响
4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-10-01 DOI: 10.1134/s0869591123050053
S. A. Silantyev, A. I. Buikin, A. R. Tshovrebova, V. V. Shabykova, V. E. Bel’tenev
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引用次数: 0
Lower Talnakh Type Intrusions of the Norilsk Ore Region 诺里尔斯克矿区下Talnakh型岩体
4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-10-01 DOI: 10.1134/s0869591123050065
S. F. Sluzhenikin, K. N. Malitch, M. A. Yudovskaya, D. M. Turovtsev, T. N. Antsiferova, S. K. Mikhalev, I. Yu. Badanina, N. G. Soloshenko
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引用次数: 1
Paleozoic Tensional Intraplate Magmatism and Mantle Evolution in Central Iran Zone: Geochemistry, Nd-Sr Isotope Data of Lamprophyres 伊朗中部古生代张性板内岩浆活动与地幔演化:煌斑岩地球化学、Nd-Sr同位素数据
IF 1.5 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-07-19 DOI: 10.1134/S0869591123040082
Sara Veysi, Seyed Mohsen Tabatabaei Manesh, Nargess Shirdashtzadeh, José Francisco Santos

A Permian-Triassic lamprophyric magmatism has developed as dyke and subvolcanic intrusions in the northeast of Isfahan Province, in Central Iran, where is so-called the Chahriseh-Bagherabad area. These rocks mainly consist of olivine, pyroxene, amphibole, and biotite as major minerals and apatite, biotite, muscovite, and opaque as minor minerals with porphyritic texture and with felsic xenoliths and xenocrysts. The Chahriseh-Bagherabad lamprophyres (CBL) magma has undergone significant crustal contamination and fractional crystallization. Based on whole rock geochemistry, these rocks belong to alkaline lamprophyres, derived from a low degree (less than 5%) partial melting of an amphibole-garnet lherzolite mantle and enriched by the lithospheric mantle in the source region. Their 87Sr/86Sr (0.70435–0.70696) and 143Nd/144Nd (0.51260–0.51276) values were supported by an enriched mantle source of the EMІI-type that has been contaminated by the continental upper crust. Thus, the CBL samples are alkaline rock formed by tensional intraplate magmatism in a Paleo-Tethyan subduction zone in the lower Paleozoic to late Permian in which metasomatism and mantle enrichment occurred. The lamprophyres magmas ascend due to tensional stress during rotation and displacement of the central-eastern Iranian microcontinent.

伊朗中部伊斯法罕省东北部的Chahriseh-Bagherabad地区发育二叠纪-三叠纪煌斑岩岩浆活动,形成岩脉和次火山侵入。主要矿物为橄榄石、辉石、角闪石和黑云母,次要矿物为磷灰石、黑云母、白云母和不透明,具有斑岩质结构,含长英质捕虏体和杂晶。Chahriseh-Bagherabad煌斑岩(CBL)岩浆经历了明显的地壳污染和分离结晶。整体岩石地球化学特征表明,这些岩石属于碱性煌斑岩,其成因为角闪石-石榴石辉橄榄岩地幔的低程度(小于5%)部分熔融,并受到源区岩石圈地幔的富集。87Sr/86Sr(0.70435 ~ 0.70696)和143Nd/144Nd(0.51260 ~ 0.51276)值受大陆上地壳污染的EMІI-type富集地幔源支持。因此,CBL样品为下古生代至晚二叠世古特提斯俯冲带张性板内岩浆作用形成的碱性岩石,该俯冲带发生交代和地幔富集作用。伊朗中东部微大陆在旋转和位移过程中受张应力作用,煌斑岩岩浆上升。
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引用次数: 0
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Petrology
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