论俯冲增生杂岩带洋板块地质构造图编图思想与方法

doi:10.13686/j.cnki.dzyzy.2022.03.005

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摘要对地质类图件编(填)图而言，合理厘定不同级别的编(填)图单元，是保证所编(填)图件质量的关键.俯冲增生杂岩带的物质组成，主要是来自洋盆不同构造环境下洋岩石圈的构造-岩石建造，可区分出洋脊建造(蛇绿岩)、深海平原建造、洋岛(OIB)-海山建造、洋内弧建造、海沟建造、源自洋岩石圈的高压-超高压岩石建造.另外，还有混入到俯冲增生杂岩带但不源自洋岩石圈，而是源自陆岩石圈的裂离地块建造、高压-超高压岩石建造、陆缘岩浆弧建造和楔顶盆地建造等.因此，查清并厘定出不同来源的地质体建造，是开展俯冲增生杂岩带编(填)图单元划分与图件编绘的基石.本文从区分出俯冲增生杂岩带内不同来源物质建造之科学目标为出发点，将它们的编图单元划分为3级:俯冲增生杂岩带(一级单元)、岩片(二级单元)、岩块和基质(三级单元).对各级编(填)图单元类型进行了具体划分和命名，规定了其代号、用色和岩性花纹的使用要求.简述了俯冲增生杂岩带构造形变的图面表达要求，强调俯冲期和碰撞期的构造变形是俯冲增生杂岩带的两大主期变形，必须合理编(填)绘.

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关键词 ：洋板块地质, 俯冲增生杂岩, 编图单元, 主期构造变形, 地质构造编图

Abstract：The quality of geological mapping lies in reasonable determination of mapping units of different levels. The compositions of subduction accretionary complex zone are mainly derived from the structure-formation of oceanic lithosphere in ocean basin under various tectonic environments, including oceanic ridge formation (ophiolite), abyssal plain formation, oceanic island-seamount formation, intra-oceanic arc formation, trench formation and high-ultrahigh pressure rock formation. Besides, there are also rifted block formation, high-ultrahigh pressure rock formation, continental margin magmatic arc formation and wedge-top basin formation derived from continental lithosphere which are mixed into the subduction accretionary complex zone. Therefore, it is basic to identify and determine the geological formations of different sources for mapping unit division and compilation. Based on the scientific objective of distinguishing different material sources in subduction accretionary complex zone, the mapping units are divided into three levels:subduction accretionary complex zone(first-level unit), slice(second-level unit) and rock block and matrix (third-level unit) which are divided and named with the requirements for code, coloring and lithologic pattern. The paper briefly describes the requirements of graphic expression of structural deformation in subduction accretionary complex zone, and emphasizes that the structural deformations during subduction and collision are the two major deformation periods, thus the mapping must be reasonable and accurate.

Key words： oceanic plate geology subduction accretionary complex mapping unit major tectonic deformation geological structural mapping

收稿日期: 2022-03-04

PACS:	P544
	P285.1

基金资助:国家自然科学基金项目"造山带洋板块地层沉积序列与构造环境研究"(41772107);中国地质调查局项目"中国区域地质志和系列图件编制"(DD20221645)和"贺州-郴州大地构造格局、资源背景调查"(DD20190811).

作者简介: 张克信(1954-), 教授, 博士生导师,从事地层学、沉积学、造山带地质和区域地质调查技术方法研究,通信地址湖北省武汉市洪山区鲁磨路388号,E-mail//kx_zhang@cug.edu.cn

引用本文:

张克信, 张进, 潘桂棠, 刘勇, 何卫红, 徐亚东, 宋博文, 张雄华. 论俯冲增生杂岩带洋板块地质构造图编图思想与方法[J]. 地质与资源, 2022, 31(3): 275-288.
ZHANG Ke-xin, ZHANG Jin, PAN Gui-tang, LIU Yong, HE Wei-hong, XU Ya-dong, SONG Bo-wen, ZHANG Xiong-hua. APPROACH OF GEOLOGICAL TECTONIC MAPPING OF OCEANIC PLATE IN SUBDUCTION ACCRETIONARY COMPLEX ZONE. GEOLOGY AND RESOURCES, 2022, 31(3): 275-288.

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