吕梁山区前寒武系地层划分评述
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A Review on Geographic Divisions for Precambrian in the Lüliang Mountains Area
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    摘要:

    笔者等是原北京地质学院山西实习大队(1959~1961)变质岩专题组的学生,第一作者一直从事这方面的地质调查和研究。45年后重聚首,花三天时间重走实习路,经热列讨论,并查阅他人成果,形成本文,讨论了50年来吕梁山区前寒武系研究成果,评述了四个代表性地层划分方案之优劣及其形成的时代背景:北京地质学院方案(1961)注重变质深浅;《山西区域地层表》 (1980)强调混合岩化;《山西区域地质志》(1989)以多期叠加褶皱为背景;《山西岩石地层》(1997)接受韧性剪切带观点。笔者等认为,用不整合关系、构造线方向、地层分布格局、各原生示顶构造等确定变质地层之间关系是可取的。但还存在如下问题:吕梁山区古元古界三群地层新老关系缺乏依据;如何正确识别侵入、熔融、变质三种成因片麻岩以及韧性剪切带和大理岩“热底辟”现象等。

    Abstract:

    Writers are students of the Lüliang Mountain Group on Metamophic Rocks, Shanxi Practicing Team(1959~1961),Beijing Institute of Geology, of them, the first writer has been engaged in geological survey and study on the same direction since that time. Writers had a 3days geological field trip in the practicing area in 2006. Discussing and reviewing on the results about Precambrian in the Lüliang Mountains area, writers put out this paper, mainly review on the 4 representative solutions of stratigraphic division for Precambrian in Lüliang Mountains area and the time background of their formation. (1) the solution of ours(1961) focuses on the degree of metamorphism;(2)Shanxi Regional Stratigraphic Table(1980) emphasis migmatization;(3) Shanxi Regional Geological Annals(1989) takes multiple phases of superimposed fold as the background;(4)Shanxi Rock Stratigraphy(1997) accepts ductile shear zone viewpoint. Writers considered that to determine the relationship between metamorphic stratigraphy with unconformity relationship, structural line direction, the stratum distribution pattern, and the original geopetal structure is recommendable. But there are still a number of questions as follow: (1) To determine relations among the three Paleoproterozoic Groups is lack of evidences in Lüliang Mountains area. (2) How to correctly identify invasive, melting, and metamorphic gneiss as well as ductile shear zone and “hot diapir”of marble.

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徐朝雷,朱关祥,檀伊洛,向贻远,杜仕鎏.2008.吕梁山区前寒武系地层划分评述[J].地质论评,54(4):459-465,[DOI].
.2008. A Review on Geographic Divisions for Precambrian in the Lüliang Mountains Area[J]. Geological Review,54(4):459-465.

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  • 收稿日期:2007-11-22
  • 最后修改日期:2008-01-25
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