扬子克拉通北缘米沧山构造带南木树锌Pb矿床成矿年龄及成矿物质来源:Rb - Sr测年和Sr - Pb同位素约束

IF 1.1 4区 地球科学 Q3 GEOLOGY Resource Geology Pub Date : 2020-06-25 DOI:10.1111/rge.12235
Zhi-Min Song, Cuihua Chen, Yulong Yang, Yan Zhang, L. Yin, Hongzhi Li
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引用次数: 2

摘要

南木树铅锌矿床位于扬子克拉通北缘米仓山构造带东段,赋存于新元古代灯影组白云岩中。本研究包括系统的野外调查、详细的矿物学研究以及矿床Rb - Sr和Pb同位素分析。同时存在的闪锌矿和方铅矿的Rb - Sr同位素定年结果显示,等时线年龄为486.7±3.1 Ma,表明矿床形成于晚寒武世至早奥陶世。这一成矿年龄与米仓山构造带古油藏的破坏时间有关。闪锌矿和方铅矿的初始87Sr/86Sr比值(0.70955 ~ 0.71212)均落在中元古代火崖群基底岩(0.70877 ~ 0.71997)和灯影组砂岩(0.70927 ~ 0.71282)的范围内,显著高于寒武系郭家坝组灰岩(0.70750 ~ 0.70980)、寒武系郭家坝组碳质板岩(0.70766 ~ 0.71012)和新元古代灯影组白云岩(0.70835 ~ 0.70876)。Sr同位素特征表明矿石锶主要为混合来源,火底崖群基底岩和灯影组砂岩均参与了成矿作用。闪锌矿和方铅矿均具有上地壳铅源特征(206Pb/204Pb = 17.849 ~ 18.022, 207Pb/204Pb = 15.604 ~ 15.809, 208Pb/204Pb = 37.735 ~ 38.402),其铅同位素均高于火崖群基底岩石,但与郭家坝组和灯影组基底岩石的铅同位素有一定的重叠。这表明铅的来源也是混合的,火崖群基底岩在其中起了重要作用。Sr、Pb同位素结果表明,火崖群基底岩是其重要的成矿物质来源之一。地质地球化学特征表明,南木树铅锌矿床具有典型的密西西比河谷型成矿特征,流体混合作用可能是南木树铅锌矿床的合理成矿机制。
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Mineralization age and sources of ore‐forming material of the Nanmushu Zn‐Pb deposit in the Micangshan Tectonic Belt at the northern margin of the Yangtze Craton, China: Constraints from Rb‐Sr dating and Sr‐Pb isotopes
The Nanmushu Zn‐Pb deposit, hosted by the Neoproterozoic Dengying Formation dolostone, is located in the eastern part of the Micangshan tectonic belt at the northern margin of the Yangtze Craton, China. This study involves a systematic field investigation, detailed mineralogical study, and Rb‐Sr and Pb isotopic analyses of the deposit. The results of Rb‐Sr isotopic dating of coexisting sphalerite and galena yield an isochron age of 486.7 ± 3.1 Ma, indicating the deposit was formed during the Late Cambrian to Early Ordovician. This mineralization age is interpreted to be related to the timing of destruction of the paleo‐oil reservoir in the Micangshan tectonic belt. All initial 87Sr/86Sr ratios of sphalerite and galena (0.70955–0.71212) fall into the range of the Mesoproterozoic Huodiya Group basement rocks (0.70877–0.71997) and Dengying Formation sandstone (0.70927–0.71282), which are significantly higher than those of Cambrian Guojiaba Formation limestone (0.70750–0.70980), Cambrian Guojiaba Formation carbonaceous slate (0.70766–0.71012), and Neoproterozoic Dengying Formation dolostone (0.70835–0.70876). Such Sr isotope signatures suggest that the ore strontium was mainly derived from a mixed source, and both of the Huodiya Group basement rocks and Dengying Formation sandstone were involved in ore formation. Both sphalerite and galena are characterized by an upper‐crustal source of lead (206Pb/204Pb = 17.849–18.022, 207Pb/204Pb = 15.604–15.809, and 208Pb/204Pb = 37.735–38.402), and their Pb isotopes are higher than, but partly overlap with, those of the Huodiya Group basement rocks, but differ from those of the Guojiaba and Dengying Formations. This suggests that the lead also originated from a mixed source, and the Huodiya Group basement rocks played a significant role. The Sr and Pb isotopic results suggest that the Huodiya Group basement rocks were one of the most important sources of metallogenic material. The geological and geochemical characteristics show that the Nanmushu Zn‐Pb deposit is similar to typical Mississippi Valley type, and the fluid mixing may be a reasonable metallogenic mechanism for Nanmushu Zn‐Pb deposit.
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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