中国东北小柯勒斑岩型铜(钼)矿床成矿事件:锆石U-Pb和钾长石Ar-Ar年代学和岩石化学证据

IF 1.1 4区 地球科学 Q3 GEOLOGY Resource Geology Pub Date : 2020-03-30 DOI:10.1111/rge.12233
Yonggang Sun, Bile Li, F. Sun, Q. Ding, Baiyi Wang, Yu-jin Li, Kun Wang
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引用次数: 11

摘要

中国东北大兴安岭是中亚造山带东段的一个重要多金属成矿带。新发现的小柯勒斑岩型铜(钼)矿床位于GXR北部。野外地质和年代学研究揭示了该矿床的两个成矿事件:早期斑岩型铜(-Mo)成矿和晚期脉状型铜成矿。先前的地质年代学研究表明,早期铜(-钼)成矿年龄约为147 Ma。40Ar/39Ar测年结果显示,蚀变铜矿化闪长岩斑岩脉中钾长石的40Ar/39Ar高原年龄为124.8±0.4 ~ 124.3±0.4 Ma,代表了覆印脉型铜矿化,与闪长岩斑岩的锆石U-Pb年龄(126.4±0.5 ~ 125.0±0.5 Ma)一致。小柯勒闪长斑岩中Cr、Ni含量高,Mg#含量高。小科勒闪长玢岩富集轻稀土元素(ree)和大离子亲石元素(Rb、Ba、K),贫重稀土元素和高场强元素(Nb、Ta、Ti), εHf(t)值为弱负(+0.29 ~ +5.27),两阶段模式年龄(TDM2)为1164ma ~ 845ma。考虑到早白垩世的区域构造背景,含矿闪长玢岩可能形成于古太平洋板块俯冲引起的岩石圈拆沉和软流圈上升流的伸展环境。这些构造事件导致了中国东北地区大规模的岩浆活动、矿化和岩石圈变薄。
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Mineralization events in the Xiaokele porphyry Cu (–Mo) deposit, NE China: Evidence from zircon U–Pb and K‐feldspar Ar–Ar geochronology and petrochemistry
The Great Xing'an Range (GXR), Northeast (NE) China, is a major polymetallic metallogenic belt in the eastern segment of the Central Asian Orogenic Belt. The newly discovered Xiaokele porphyry Cu (–Mo) deposit lies in the northern GXR. Field geological and geochronological studies have revealed two mineralization events in this deposit: early porphyry‐type Cu (–Mo) mineralization, and later vein‐type Cu mineralization. Previous geochronological studies yielded an age of ca. 147 Ma for the early Cu (–Mo) mineralization. Our 40Ar/39Ar dating yielded 40Ar/39Ar plateau ages of 124.8 ± 0.4 to 124.3 ± 0.4 Ma on K‐feldspar in altered Cu‐mineralized diorite porphyrite dikes that represent the overprinting vein‐type Cu mineralization, consistent with zircon U–Pb ages of the diorite porphyrite (126.4 ± 0.5 to 125.0 ± 0.5 Ma). The Cr and Ni contents and Mg# of the Xiaokele diorite porphyrites are high. The diorite porphyrites at Xiaokele are enriched in light rare‐earth elements (REEs), and large‐ion lithophile elements (e.g., Rb, Ba, and K), are depleted in heavy REEs and high‐field‐strength elements (e.g., Nb, Ta, and Ti), and have weak negative εHf(t) values (+0.29 to +5.27) with two‐stage model ages (TDM2) of 1,164–845 Ma. Given the regional tectonic setting in Early Cretaceous, the ore‐bearing diorite porphyrites were likely formed in an extensional environment related to lithospheric delamination and asthenospheric upwelling induced by subduction of the Paleo‐Pacific Plate. These tectonic events caused large‐scale magmatic activity, ore mineralization, and lithospheric thinning in NE China.
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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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