The relationship between hydrocarbon accumulation and Mississippi Valley‐type Pb‐Zn mineralization of the Mayuan metallogenic belt, the northern Yangtze block, SW China: Evidence from ore geology and Rb‐Sr isotopic dating

IF 1.1 4区 地球科学 Q3 GEOLOGY
Resource Geology Pub Date : 2020-01-06 DOI:10.1111/rge.12229
Guozhi Wang, Zhu Huang, Fufeng Zhao, Na Li, Yuzhen Fu
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引用次数: 5

Abstract

The coexistence of Pb‐Zn deposits and oil/gas reservoirs demonstrates that a close genetic connection exists between them. The spatiotemporal relationship between Pb‐Zn mineralization and hydrocarbon accumulation is the key to understanding this genetic connection. The Mayuan large‐scale Pb‐Zn metallogenic belt is composed of a number of Mississippi Valley‐type (MVT) Pb‐Zn deposits that were recently discovered on the northern margin of the Yangtze Block, China. It is hosted in the dolostone of the Sinian (Ediacaran) Dengying Formation (Z2dn). In addition to the abundant bitumen in the Mayuan Pb‐Zn metallogenic belt, the paleo‐oil reservoir and the MVT Pb‐Zn deposit overlap in space. In this study, two precise ages of 468.3 ± 3.8 Ma and 206.0 ± 6.5 Ma were obtained via the Rb‐Sr isotopic dating of galena and sphalerite from the Mayuan Pb‐Zn metallogenic belt, respectively. The early metallogenic age of 468.3 ± 3.8 Ma is similar to the previously published age of 486 ± 12 Ma. The age of 206.0 ± 6.5 Ma is consistent with the age of the metallogenic event that occurred at 200 Ma in the Upper Yangtze Pb–Zn metallogenic province of the Sichuan‐Yunnan‐Guizhou polymetallic zone, which is located on the southwest margin of the Sichuan Basin, suggesting that the metallogenic effects of this period were regional in scale in the peripheral areas of the Sichuan Basin. Previous studies have shown that two periods of hydrocarbon accumulation occurred in the oil/gas reservoir that coexists with the Pb‐Zn deposits in the study area. The Pb‐Zn mineralization at 468.3 ± 3.8 Ma occurred during the first period of hydrocarbon accumulation, while the second mineralization at 206.0 ± 6.5 Ma occurred during the transformation of the paleo‐oil reservoir to a paleogas reservoir. The spatial relationship between the paleo‐oil/‐gas reservoir and the MVT Pb‐Zn deposits and the temporal relationship between mineralization and hydrocarbon accumulation show that a close genetic relationship exists between the MVT Pb‐Zn mineralization and hydrocarbon accumulation. Analysis of metals in the source rocks forming the paleo‐oil/‐gas reservoirs show that source rocks which formed paleo‐oil/‐gas reservoirs may have provided metals for Pb‐Zn mineralization. Both the paleo‐oil/‐gas reservoirs and Pb‐Zn mineralizing fluids had the same origin.
华北扬子地块马源成矿带油气成藏与密西西比河谷型铅锌矿化的关系:矿石地质和Rb - Sr同位素定年证据
铅锌矿床与油气藏的共存表明两者之间存在着密切的成因联系。Pb - Zn矿化与油气成藏的时空关系是理解这一成因联系的关键。马源大型铅锌成矿带是由近年来在扬子地块北缘发现的多处密西西比河谷型铅锌矿床组成的。赋存于震旦系(埃迪卡拉系)灯影组(Z2dn)白云岩中。马源铅锌矿成矿带除富含沥青外,古油藏与MVT铅锌矿床在空间上有重叠。本文通过对马源铅锌成矿带方铅矿和闪锌矿的Rb - Sr同位素定年,分别获得了468.3±3.8 Ma和206.0±6.5 Ma的精确年龄。早期成矿年龄为468.3±3.8 Ma,与已有的486±12 Ma相近。206.0±6.5 Ma与位于四川盆地西南边缘的川滇黔多金属带上扬子铅锌成矿省200 Ma成矿事件的年龄一致,表明该时期的成矿作用在四川盆地外围地区具有区域性。前人的研究表明,研究区与铅锌矿共生的油气储层经历了两期油气成藏。468.3±3.8 Ma的Pb - Zn成矿作用发生在第一次油气成藏期,206.0±6.5 Ma的Pb - Zn成矿作用发生在古油藏向古气藏转变过程中。古油气储层与MVT型铅锌矿床的空间关系以及成矿作用与油气成藏的时间关系表明,MVT型铅锌矿化与油气成藏存在密切的成因关系。对古油气成藏源岩中金属元素的分析表明,古油气成藏源岩可能为铅锌成矿提供了金属元素。古油气储层和铅锌成矿流体具有相同的成因。
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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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