| The C-O and Zn isotopic compositions of the Laochang Ag-Pb-Zn ore bodies in the Changning-Menglian suture zone,and its geological implicationsSCIEI北大核心CSCD |
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| 引用本文： | 唐鑫,陈福川,张鹏飞,李龚健,赵枫,陈威.The C-O and Zn isotopic compositions of the Laochang Ag-Pb-Zn ore bodies in the Changning-Menglian suture zone,and its geological implicationsSCIEI北大核心CSCD[J].岩石学报,2022,38(1):143-156. |
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| 作者姓名： | 唐鑫 陈福川 张鹏飞 李龚健 赵枫 陈威 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083;昆明理工大学国土资源工程学院, 昆明 650093;内江师范学院地理与资源科学学院, 内江 641100;盛屯矿业股份有限公司, 厦门 361012 |
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| 基金项目： | 本文受国家重点基础研究发展计划（2015CB452606）、国家自然科学基金重大研究计划（91855217）和国家自然科学基金青年项目（41902070）联合资助 |
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| 摘 要： | 老厂矿床是昌宁-孟连缝合带内唯一大型矿床,本文报道了老厂矿床Ag-Pb-Zn矿体中Ⅰ号矿体群下部块状矿体和上部网脉状矿体的方解石C-O同位素组成,以及Ⅰ、Ⅱ、Ⅳ三个矿体群内闪锌矿的Zn同位素组成。Ⅰ号矿体群下部块状矿体和上部网脉状矿体方解石δ13CPDB的范围分别为-6.17‰～2.71‰和-2.18‰～3.87‰,δ18OPDB的范围分别为-19.57‰～-17.23‰和-22.10‰～-16.21‰;计算获得对应成矿流体的δ13CCO2为-6.16‰～1.53‰和-2.39‰～6.43‰,δ18OH2O分别为1.62‰～7.62‰和4.36‰～16.92‰,通过与岩浆CO2(δ13C=-2‰～-8‰)和围岩灰岩(δ13C=-1.6‰～4.0‰)的δ13C值相比较,指示块状矿体成矿流体中的碳主要来自岩浆,网脉状矿体成矿流体中...
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| 关 键 词： | 老厂矿床Ag-Pb-Zn矿体 昌宁-孟连缝合带 Zn同位素 C-O同位素 物质来源 |
| 收稿时间： | 2021/8/20 0:00:00 |
| 修稿时间： | 2021/12/2 0:00:00 |
The C-O and Zn isotopic compositions of the Laochang Ag-Pb-Zn ore bodies in the Changning-Menglian suture zone, and its geological implications |
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| TANG Xin,CHEN FuChuan,ZHANG PengFei,LI GongJian,ZHAO Feng,CHEN Wei.The C-O and Zn isotopic compositions of the Laochang Ag-Pb-Zn ore bodies in the Changning-Menglian suture zone, and its geological implications[J].Acta Petrologica Sinica,2022,38(1):143-156. |
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| Authors: | TANG Xin CHEN FuChuan ZHANG PengFei LI GongJian ZHAO Feng CHEN Wei |
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| Institution: | State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing 100083, China;Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;School of Geogrophy and Resource Science, Neijiang Normal University, Neijiang 641100, China; Chengtun Mining Group Co. Ltd, Xiamen 361012, China |
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| Abstract: | The Laochang deposit is the only large ore deposit in the Changning-Menglian suture zone. In this study, the C-O isotopic compositions of calcites from the lower massive ore bodies and the upper stockwork ore bodies of No. I ore bodies in Laochang Ag-Pb-Zn ore bodies and the Zn isotopic compositions of sphalerites from No. I , II , IV ore bodies are investigated. The range of delta C-13(PDB) of calcites from the lower massive ore bodies and the upper stockwork ore bodies of No. I ore bodies is - 6. 17 parts per thousand similar to 2. 71 parts per thousand and - 2. 18 parts per thousand similar to 3.87 parts per thousand, respectively, and the range of delta O-18( )PDB is - 19. 57 parts per thousand similar to - 17.23 parts per thousand and - 22. 10 parts per thousand similar to 16. 21 parts per thousand, respectively. The delta(13) C-CO2 of the corresponding ore-forming fluids are calculated to be - 6. 16 parts per thousand similar to 1. 53 parts per thousand and - 2. 39 parts per thousand similar to 6. 43 parts per thousand, respectively, and the delta(OH2O)-O-18 are calculated to be 1.62 parts per thousand similar to 7. 62 parts per thousand and 4. 36 parts per thousand similar to 16. 92 parts per thousand, respectively. By comparison with the delta C-13 of magmatic CO2 (delta C-13 = - 2 parts per thousand similar to- 8 parts per thousand) and wall-rock limestone (delta C-13 = - 1. 6 parts per thousand similar to 4. 0 parts per thousand) , it indicates that the carbon in the oreforming fluids of massive ore bodies mainly comes from magma, while the carbon in the ore-forming fluids of stockwork ore bodies mainly comes from limestone, which further shows that there is strong water-rock reaction in the deep part of Laochang deposit. The delta Zn-66 and delta Zn-68 values of ten sphalerites are 0. 17 parts per thousand similar to 0. 25 parts per thousand and 0. 33 parts per thousand similar to 0. 49 parts per thousand, respectively, which coincides with the Zn isotopic compositions of VMS deposits and modern submarine hydrothermal fluids. The homogeneous Zn isotopic compositions at different elevations implies that the Zn isotopic compositions of sphalerite from Ag-Pb-Zn orebodies in Laochang deposit are almost unaffected by temperature, fractionation and microbial action. And it can directly reflect the Zn isotopic compositions of the metal source, revealing the genesis type of the Laochang Ag-Pb-Zn ore body as VMS-type, and the metallogenic metal mainly comes from the Lower Carboniferous submarine volcanism. |
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| Keywords: | Ag-Pb-Zn ore bodies of Laochang deposit Changning-Menglian suture zone Zn isotope C-O isotope Source of materials |
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