| 柴北缘阿日特克山斑岩型铜钼矿床流体包裹体、稳定同位素特征及其地质意义 |
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| 引用本文： | 唐名鹰,朱德全,丁正江,陈建,王炜晓,董振昆,高振华,苗晓军,郑成龙.柴北缘阿日特克山斑岩型铜钼矿床流体包裹体、稳定同位素特征及其地质意义[J].吉林大学学报(地球科学版),2022,52(5):1525-1539. |
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| 作者姓名： | 唐名鹰 朱德全 丁正江 陈建 王炜晓 董振昆 高振华 苗晓军 郑成龙 |
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| 作者单位： | 1.山东省第八地质矿产勘查院，山东 日照2768262.山东省地矿局有色金属矿找矿与资源评价重点实验室，山东 日照2768263.山东省深部金矿探测大数据应用开发工程实验室，山东 威海2642094.山东省第六地质矿产勘查院，山东 威海642095.山东理工大学资源与环境工程学院，山东 淄博 255000 |
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| 摘 要： | 阿日特克山铜钼矿床位于柴北缘中北段，为近年来新发现的隐伏斑岩型矿床，矿体产出于海西晚期—印支期花岗闪长（斑）岩和古元古代达肯大坂岩群接触部位。为探讨该矿床成矿流体特征和成矿机制，本文对矿床野外地质特征、流体包裹体及稳定同位素组成进行了系统的研究。根据不同类型矿脉之间的相互关系，可将热液成矿期次划分为成矿早期石英阶段、成矿期辉钼矿-多金属硫化物-石英阶段和成矿晚期石英-方解石阶段。流体包裹体岩相学研究表明，阿日特克山铜钼矿床流体包裹体以Ⅰ型（富液相L+V两相水溶液包裹体）、Ⅱ型（富气相L+V两相水溶液包裹体）和Ⅲ型（含子矿物三相水溶液包裹体）为主。显微测温及包裹体拉曼光谱分析结果显示，成矿流体体系为中高温、中低盐度、中高密度的NaCl-H2O体系，至成矿晚期，流体性质变化为低温、低盐度、高密度流体，矿床形成深度为0.40~4.00 km。氢氧同位素分析测试结果显示，δDV-SMOW值为-92.9‰~-78.4‰，δ18OH2O值为-7.4‰~2.0‰，表明成矿流体以混合流体为主，随着成矿流体的演化，有更多的大气降水不断混入。矿石中金属硫化物δ34S值处于9.4‰~11.7‰之间，平均值为10.2‰，表现出明显的地层硫特征，为岩浆热液与围岩地层相互作用所致。综上认为，阿日特克山铜钼矿床为矽卡岩型-斑岩型矿床，形成于海西晚期—印支期俯冲碰撞构造环境，混合成矿流体强烈的不混溶作用为斑岩型铜钼矿床形成的主要机制。
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| 关 键 词： | 流体包裹体 稳定同位素 斑岩型铜钼矿床 阿日特克山 柴北缘 |
| 收稿时间： | 2021-12-09 |
Fluid Inclusions,Stable
Isotope Characteristics and Geological Significance of Aritekeshan Porphyry Cu-Mo Deposit in Northern Qaidam Basin |
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| Tang Mingying,Zhu Dequan,Ding Zhengjiang,Chen Jian,Wang Weixiao,Dong Zhenkun,Gao Zhenhua,Miao Xiaojun,Zheng Chenglong.Fluid Inclusions,Stable
Isotope Characteristics and Geological Significance of Aritekeshan Porphyry Cu-Mo Deposit in Northern Qaidam Basin[J].Journal of Jilin Unviersity:Earth Science Edition,2022,52(5):1525-1539. |
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| Authors: | Tang Mingying Zhu Dequan Ding Zhengjiang Chen Jian Wang Weixiao Dong Zhenkun Gao Zhenhua Miao Xiaojun Zheng Chenglong |
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| Abstract: | Aritekshan Cu-Mo deposit is a newly
discovered concealed porphyry deposit, located in the central-north part of the
northern Qaidam basin. The orebodies occurred in the contact area between the
Late Hercynian-Indosinian granodiorite (porphyry) and Paleoproterozoic
Dakendaban Group. In order to explore the characteristics of ore-forming
fluids, the ore-forming mechanism and genesis of the deposit, this paper
systematically studied the field geological characteristics, fluid inclusions
and stable isotope composition of the deposit. According to the relationship
between different types of ore veins, the hydrothermal metallogenic stages can
be divided into the early mineralization quartz stage, molybdenum-polymetallic
sulfide-quartz stage and late mineralization quartz-calcite stage. The fluid
inclusions are mainly Type Ⅰ (liquid-rich L+V
two-phase aqueous inclusions), Type Ⅱ
(gas-rich L+V two-phase aqueous inclusions) and Type Ⅲ (three-phase aqueous solution
inclusions containing daughter minerals). The results of microthermometry and
inclusion Raman spectrum analysis show that the ore-forming fluid system is
NaCl-H2O system with medium-high temperature, medium-low salinity,
and medium-high density. In the late stage of mineralization, the properties of
the fluids changed to low temperature, low salinity and high density fluid,
with the deposit formation depth of 0.40-4.00 km. The values of DV-SMOW and δ18 OH2O range
from -92.9‰ to -78.4‰ and -7.4‰ to 2.0‰ respectively, indicating that
the ore-forming fluids are mainly mixed fluids. With the evolution of
ore-forming fluids, the continuous mixing of meteoric water affects
mineralization. Theδ34S of metal sulfide in the ore
ranges from 9.4‰ to 11.7‰, with an average value of 10.2‰, showing obvious characteristics
of strata sulfur, which is caused by the interaction between magmatic
hydrothermal fluid and surrounding rock strata. It is believed that Aritekshan Cu-Mo deposit is a skarn-porphyry
type deposit, which was formed in the subduction and collision during Late
Hercynian-Indosinian, which is consistent with the diagenetic age of
granodiorite. The strong immiscibility of mixed ore-forming fluids is the main
mechanism of the formation of porphyry Cu-Mo deposit. |
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| Keywords: | fluid inclusion stable isotope porphyry Cu-Mo deposit Aritekeshan northern Qaidam basin |
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