Origin of the Xitieshan Pb-Zn deposit, Qinghai, China: Evidence from petrography and S-C-O-Sr isotope geochemistry
Origin of the Xitieshan Pb-Zn deposit, Qinghai, China: Evidence from petrography and S-C-O-Sr isotope geochemistry
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中国青海锡铁山铅锌矿床的成因：岩相学和 S-C-O-Sr 同位素地球化学证据
DOI：
10.1016/j.oregeorev.2021.104429
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发表时间：
2021-08
影响因子：
3.3
通讯作者：
Pfaff Katharina
中科院分区：
文献类型：
--
作者：
Zhao Zhixin;Leach David L.;Wei Junhao;Liang Shengnan;Pfaff Katharina
锡铁山铅锌存款矿床位于柴北缘造山带，地质资源量6400万吨，锌品位4.86%，铅品位4.16%。矿化带产于中晚奥陶世弧后盆地中的变质火山-沉积岩系滩间山群。锡铁山铅锌矿原岩和容矿岩石经下绿片岩相-中角闪岩相变质变形作用，形成含矿带，含矿带主要为大理岩和片岩。大理石中的硫化物由黄铁矿、闪锌矿、方铅矿和白铁矿组成，并伴有黄铜矿，其结构未变形，反映了原始碳酸盐交代矿化。磁黄铁矿、黄铁矿、闪锌矿和方铅矿是片岩中的主要硫化物，它们以层状硫化物层的形式出现，这些硫化物层挤压、膨胀并符合片岩的叶理。片岩型矿化是一种再活化共生组合，反映了动力变质作用过程中原始硫化物的重结晶和物理迁移穿过这些矿物的脆-韧性边界。成矿阶段硫化物的硫同位素组成集中在-1 ‰至+5‰之间，与主岩系中火山岩淋滤或岩浆相关流体的硫同位素组成一致。蚀变大理岩的碳、氧和锶同位素模式（δ 13 C = −3.8至−1.5‰，δ 18 O = 8.7至12.2‰，87 Sr/86 Sr = 0.713092至0.713503）表明与热液流体进行了广泛的同位素交换。锡铁山与硫化物共生的脉石矿物包括铁白云石和菱铁矿，其C、O和Sr同位素组成（δ 13 C = −1至+1.7‰，δ 18 O = 2.3至7.8‰，87 Sr/86 Sr = 0.715707至0.722918）和结构指示原始海相碳酸盐岩与岩浆相关热液之间的置换反应。考虑到锡铁山成矿流体在火山岩序列中交代了碳酸盐岩，以及容矿岩石、矿物学、蚀变和硫同位素组成的相似性，存款最有可能的成因模式是与侵入岩有关的碳酸盐岩交代存款，随后经历了变质变形作用。
The Xitieshan Pb-Zn deposit in the North Qaidam orogenic belt, contains a geologic resource of 64 million tons grading 4.86 percent Zn and 4.16 percent Pb. The mineralized zones are hosted by the Tanjianshan Group, a metamorphosed succession of volcanic-sedimentary rocks in a Middle to Late Ordovician back-arc basin. Lower greenschist to middle amphibolite facies metamorphism and deformation of the original Xitieshan Pb-Zn ores and host rocks resulted in zones hosted in marble and schist. Sulfides in the marble consist of pyrite, sphalerite, galena, and marcasite with accessory chalcopyrite with undeformed textures that reflect the original carbonate replacement mineralization. Pyrrhotite, pyrite, sphalerite, and galena are the major sulfides in the schist-hosted ores, which occur as laminated sulfide layers that pinch, swell, and conform to the foliation of the schist. The schist-hosted mineralization occurs as a remobilized paragenetic assemblage that reflects the recrystallization and physical migration of the original sulfides across the brittle-ductile boundaries of these minerals during dynamic metamorphism. The sulfur isotopic compositions of ore-stage sulfides cluster around values of −1‰ to +5‰, consistent with sulfur derived from leaching volcanic rocks in the host sequence, or magmatic-related fluids. Carbon, oxygen, and strontium isotope patterns of the altered marble (δ13C = −3.8 to −1.5‰, δ18O = 8.7 to 12.2‰, and87Sr/86Sr = 0.713092 to 0.713503) indicate extensive isotopic exchange with hydrothermal fluids. Gangue minerals, including ankerite and siderite, intergrown with sulfides at Xitieshan have C, O, and Sr isotopic compositions (δ13C = −1 to +1.7‰, δ18O = 2.3 to 7.8‰, and87Sr/86Sr = 0.715707 to 0.722918) and textures indicative of replacement reactions between an originally marine carbonate rock and magmatic-related hydrothermal fluids. Considering the Xitieshan ore fluids replaced carbonate in a volcanoclastic sequence together with the similarities of host rocks, mineralogy, alterations, and sulfur isotope composition, the most likely genetic model for the deposit is an intrusion-related carbonate replacement deposit that underwent subsequent metamorphism and deformation.
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影响因子：
2.7
作者：
CRAIG, JR;VOKES, FM
通讯作者：
VOKES, FM
影响因子：
3.1
作者：
Shuguang Song;Lifei Zhang;J. Chen;J. Liou;Y. Niu
通讯作者：
Shuguang Song;Lifei Zhang;J. Chen;J. Liou;Y. Niu
DOI：
10.1007/978-3-319-78527-1
发表时间：
1973
期刊：
Stable Isotope Geochemistry
影响因子：
--
作者：
J. Hoefs
通讯作者：
J. Hoefs
激光烧蚀过程中黄铁矿中的硫同位素分馏：激光烧蚀多收集器电感耦合等离子体质谱图的影响
影响因子：
3.9
作者：
Zhu Zhi Yong;Jiang Shao Yong;Ciobanu Cristiana L;Yang Tao;Cook Nigel J
通讯作者：
Cook Nigel J
影响因子：
2.9
作者：
T. Tütken;A. Eisenhauer;Bettina A. Wiegand;B. T. Hansen
通讯作者：
T. Tütken;A. Eisenhauer;Bettina A. Wiegand;B. T. Hansen