| 红格岩体的围岩及其时代 |
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| 引用本文： | 吴根耀
,王明坤
,刘成.红格岩体的围岩及其时代[J].地层学杂志,1987(4). |
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| 作者姓名： | 吴根耀 王明坤 刘成 |
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| 摘 要： | <正> 一、红格岩体围岩概述 红格含钒钛磁铁矿基—超基性岩体(以下简称含矿岩体)位于四川省渡口市东北郊。其围岩北延入米易县,西南延部分构成渡口市内攀枝花含矿岩体的围岩。在红格岩体的勘探过程中,四川省地质矿产局攀西地质八队对其围岩作了不少工作,在这个南北向断裂较为发育的地区发现了若干条岩层出露较好且相对连续的剖面,建立了相应的群、组名称。在此基础上,笔者重新观察了这些剖面并作了室内研究,按地层规范对群、组名称作了若干修正,与会理南部和云南元谋的有关地层进行了对比。该岩体的围岩,明显由两大套地层组成(图1),概述如下。
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Wall rock of the Hongge pluton and its age |
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| Abstract: | The Hongge mafic-ultramafic pluton is situated in the northeastern suburbs of Dukou City, Sichuan. Its wall rocks can be separated into two suites. The immediate one is named Miyi Group, which is divided ascendingly into the Panjiatian, Zhifanggou and Anningcun Formations. The indirect wall rock is named Hongge Group, consisting of Luku, Huangjiashan and Naerba Formations. The mineral assemblages show that the former belongs to metamorphism of medium grade and the latter to the one of lower grade. The strata underlying the Miyi Group are named Yakou Complex, from which the date of 2957 Ma has been got. Previous Miyi Group and Hongge Group were regarded as Upper Sinian, Lower Cambrian and Permian. Ten aspects of evidences (including rock association, ore deposits, geochemistry, stromatolite, deformation, "unconformity", contact metamorphism, etc.) have been put forward, which deny the predecessors' conclusions. Miyi Group may be correlated with Pudeng Formation in Yuanmou region, northern Yunnan. The equivalent of the Yakou Complex is the lower and middle submembers of the Ist member of the Pudeng Formation (granite or granitic gneiss); the Ist member of the Panjiatian Formation may be correlated with the upper submember of the Ist member of the Pudeng Formation, the 2nd, the 3rd and the lower part of the 4th member of the Panjiatian Formation with the 2nd member of Pudeng Formation (marble, dolomitic marble); the middle and upper parts of the 4th member of Panjiatian Formation and the Zhifanggou Formation with the 3rd member of Pudeng Formation. The equivalent of the 4th member of Pudeng Formation is Anningcun Formation. |
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