The magmatic origin of propylitic alteration of the Zhengguang epithermal Au-Zn deposit, Heilongjiang, China: evidence from mineral compositions and H–O-Sr isotopes

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2024-01-17 DOI:10.1007/s00126-023-01243-2
Le Wang, Ming-Jian Cao, Shen Gao, Massimo Chiaradia, Pete Hollings, Ke-Zhang Qin, Xin-Yu Zou, Guo-Xue Song, Xu-Yong Pang, Guang-Ming Li
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Abstract

The origin of propylitic fluids in intermediate sulfidation mineralization has not been investigated in detail. Here, we present an extensive petrographic, geochemical, and isotopic (O-H-Sr) study of propylitic epidote, chlorite, and calcite from the Zhengguang intermediate sulfidation epithermal Au-Zn deposit, NE China. Propylitic minerals can be divided into three main types based on their different textural occurrences, namely interstitial cement of clasts of hydrothermal breccia, replacement of primary plagioclase or hornblende, and vein infill of cracks, with late, minor calcite as amygdules in vesicles of andesite representing a fourth textural occurrence. The H-O isotope compositions and mass balance calculations suggest that most propylitic epidote records a dominant (> 50%) contribution of magmatic fluids. The decrease of the average δ18\({\mathrm O}_{{\mathrm H}_2\mathrm O}\;\)values equilibrated with different types of epidote (cement 6.8 ± 0.7‰, replacement 5.1 ± 1.1‰, vein 4.5 ± 1.4‰, 1 SD), and the decreasing content of high-temperature elements (e.g., Cu-Mo) from cement, through replacement to vein epidote and chlorite, collectively indicates a decreasing role of magmatic fluids. Replacement epidote and chlorite are enriched in Sr-Mn-Y-Sb, whereas replacement epidote and calcite record similar (87Sr/86Sr)i values to the andesitic host rock, suggesting that replacement minerals inherit certain elements from plagioclase and hornblende, and the Sr isotope signature of the wall rocks. We highlight that propylitic alteration in epithermal deposits can involve significant proportions of magmatic fluids and texturally different alteration mineral types should be considered when using mineral isotopic or chemical compositions to track fluid sources or to vector towards the location of intrusive centers.

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中国黑龙江正光热液型金锌矿床丙基蚀变的岩浆起源:矿物成分和 H-O-Sr 同位素证据
关于中间硫化成矿过程中丙基流体的来源,还没有进行过详细的研究。在此,我们对中国东北正光中级硫化表生金锌矿床中的丙闪石、绿泥石和方解石进行了广泛的岩石学、地球化学和同位素(O-H-Sr)研究。丙闪石矿物可根据其不同的质地特征分为三大类,即热液角砾岩碎屑的间隙胶结物、原生斜长石或角闪石的置换物以及裂隙的矿脉填充物,第四种质地特征是安山岩囊泡中的晚期小方解石。H-O同位素组成和质量平衡计算表明,大多数丙闪石记录了岩浆流体的主要贡献(50%)。平均δ18({\mathrm O}_{\mathrm H}_2\mathrm O}\;\)值的下降与不同类型的表土(胶结物 6.8 ± 0.7‰,置换物 5.1 ± 1.1‰,脉石 4.5 ± 1.4‰,1 SD)的平衡以及高温元素含量的下降(例如、从胶结物到脉石和绿泥石的置换,以及高温元素(如铜钼元素)含量的减少,共同表明岩浆流体的作用正在减弱。置换表长石和绿泥石富含Sr-Mn-Y-Sb,而置换表长石和方解石的(87Sr/86Sr)i值与安山质主岩相似,这表明置换矿物继承了斜长石和角闪石中的某些元素,以及岩壁岩石的Sr同位素特征。我们强调,热液矿床中的丙基蚀变可能涉及相当比例的岩浆流体,在利用矿物同位素或化学成分追踪流体来源或矢量确定侵入中心位置时,应考虑质地不同的蚀变矿物类型。
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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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