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首页> 外文期刊>Journal of Asian earth sciences >The association of mafic-ultramafic intrusions and A-type magmatism in the Tian Shan and Altay orogens, NW China: Implications for geodynamic evolution and potential for the discovery of new ore deposits
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The association of mafic-ultramafic intrusions and A-type magmatism in the Tian Shan and Altay orogens, NW China: Implications for geodynamic evolution and potential for the discovery of new ore deposits

机译：中国西北天山和阿尔泰造山带的铁镁铁-超铁屑岩侵入与A型岩浆作用的关系：对地球动力学演化的影响以及发现新矿床的潜力

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The NW China region is characterised by tectonic and lithostratigraphic domains, such as the Tian Shan and Altay orogens, the Tarim, Junggar and Turpan Basins. The Tian Shan and Altay orogens are part of the Central Asian Orogenic Belt. The NW China region was affected by a series of thermal events that occurred between the Silurian and the Triassic, which resulted in the emplacement of numerous granitic plutons and mafic-ultramafic intrusions. A number of these granitic plutons are of A-type affiliation, which on the basis of the positive εNd values are likely to have been derived from mantle sources. In addition, at least two large igneous provinces (LIPs) can be recognised in NW China, namely the 345-325 Ma Tian Shan LIP and the ca. 270-280 Ma Tarim LIP. Age and field data suggest a spatial and temporal relationship between the mafic-ultramafic intrusions and A-type granites within the LIPs. In this paper we discuss mafic-ultramafic intrusions that host magmatic Ni-Cu sulphide deposits (Kalatongke in the Altay, Huangshan and Poyi-Poshi) in the eastern Tian Shan. These intrusions are typically zoned, characterised by an envelope of early gabbroic rocks that enclose later ultramafic units. These zoned mafic-ultramafic intrusions have some features that are comparable with Alaskan-type complexes. Taking into consideration the spatial-temporal relationship of the mafic, mafic-ultramafic rocks and A-type granites, we suggest that these magmatic events occurred during an extensional regime, possibly related to a mantle superplume event that affected much of central Asia during the Permian, of which the Siberian Traps and the Emeishan continental flood basalts of SW China are part. If the A-type felsic magmatism took place during a superplume event, we also suggest that these rocks may be conducive to host iron-oxide-copper-gold (IOCG) style mineralisation. We conclude with a model that attempts to explain the relationship between the zoned mafic-ultramafic intrusions and mantle plume activity in NW China during the Permian.
机译：中国西北地区具有构造和岩石地层学特征，例如天山和阿尔泰造山带，塔里木盆地，准gar尔盆地和吐鲁番盆地。天山造山带和阿勒泰造山带是中亚造山带的一部分。中国西北地区受到志留纪和三叠纪之间发生的一系列热事件的影响，这导致了许多花岗岩岩体和镁铁质超音波侵入体的入侵。这些花岗岩体中有许多是A型隶属关系，基于正εNd值，很可能源自地幔来源。此外，在中国西北地区至少可以识别两个大的火成岩省（LIP），即345-325马田山LIP和CA。 270-280 Ma Tarim LIP。年龄和田野数据表明，LIP内的铁质-超镁铁质侵入体与A型花岗岩之间存在时空关系。在本文中，我们讨论了在东天山东部存在岩浆-超铁屑岩侵入体的岩浆镍铜硫化物矿床（阿勒泰的卡拉通克，黄山和波伊-波士）。这些侵入物通常是按区域划分的，其特征是早期辉长岩的包裹层包围了后来的超镁铁质单元。这些分区的铁质-超音波侵入体具有某些特征，可与阿拉斯加型复合体相媲美。考虑到镁铁质，镁铁质-超镁铁质岩石和A型花岗岩的时空关系，我们建议这些岩浆事件发生在伸展时期，可能与二叠纪期间影响中亚大部分地区的地幔超软泥事件有关。中国西南部的西伯利亚圈闭和峨眉山大陆性洪水玄武岩是其中的一部分。如果A型长英质岩浆作用发生在超级事件期间，我们还建议这些岩石可能有助于孕育氧化铁-铜-金（IOCG）样式的矿化。我们以一个模型作为结论，试图解释二叠纪中国西北地区带状镁铁-超铁屑侵入体与地幔柱活动之间的关系。

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