| 印度洋北部马克兰增生楔泥火山分布及主控因素探讨 |
| |
| 引用本文： | 龚建明,廖晶,张莉,何拥军,翟滨,孟明,成海燕.印度洋北部马克兰增生楔泥火山分布及主控因素探讨[J].现代地质,2018,32(5):1025. |
| |
| 作者姓名： | 龚建明 廖晶 张莉 何拥军 翟滨 孟明 成海燕 |
| |
| 作者单位： | (1青岛海洋地质研究所，山东 青岛266071；2海洋国家实验室 海洋矿产资源评价与探测技术功能实验室，山东 青岛266061；
3自然资源部天然气水合物重点实验室，山东 青岛266071；4广州海洋地质调查局，广东 广州510760；
5中国地质大学(北京) 海洋学院，北京100083；6中国冶金地质总局 青岛地质勘查院，山东 青岛266061) |
| |
| 基金项目： | 国家自然科学基金项目“祁连山冻土区天然气水合物气源成因研究”(41273066)；国家青年科学基金项目“南海北部神狐海域深水水道演化与水合物成藏的关系”(41406080)；国家重点研发计划项目(2018YFC0310000)。 |
| |
| 摘 要： | 为了探讨低角度俯冲背景下活动大陆边缘泥火山的分布及其主控因素，收集了大量印度洋北部马克兰增生楔地区的沉积地层、断裂构造及泥火山或泥底辟等资料。综合分析结果显示，研究区沉积地层主要由上、下两部分组成，其中，下部较细的半远洋泥质地层具有“东厚西薄”的特征，而上部较粗的马克兰砂地层具有高速沉积的特征。这种密度倒置且后期沉积速率很高的地层分布特征为该区泥底辟或泥火山的形成提供了物质基础。在马克兰增生楔，阿拉伯板块向欧亚板块汇聚的速率具有“东快西慢”的特点，而且东、西两侧走滑断层和泥火山发育。结合俯冲角度同样较低的地中海海岭板块汇聚速率与泥火山的分布特征认为，马克兰增生楔东、西两侧的泥火山主要受走滑断层的控制，而增生楔内部的泥火山主要受板块汇聚速率、逆冲断裂以及密度倒置等综合因素的控制，表现为“东多西少”的特征。
|
| 关 键 词： | 沉积特征 汇聚速率 泥火山 主控因素 马克兰增生楔 |
Discussion on the Distribution and Main Controlling Factors of Mud
Volcanoes in Makran Accretionary Wedge，Northern Indian Ocean |
| |
| GONG Jianming,LIAO Jing,ZHANG Li,HE Yongjun,ZHAI Bin,MENG Ming,CHENG Haiyan.Discussion on the Distribution and Main Controlling Factors of Mud
Volcanoes in Makran Accretionary Wedge，Northern Indian Ocean[J].Geoscience——Journal of Graduate School,China University of Geosciences,2018,32(5):1025. |
| |
| Authors: | GONG Jianming LIAO Jing ZHANG Li HE Yongjun ZHAI Bin MENG Ming CHENG Haiyan |
| |
| Abstract: | In order to study the distribution and main controlling factors of mud volcanoes in the active continental margin in low angle subduction background, a large amount of data on sedimentary strata, fault structures, mud volcanoes or mud diapir have been collected in the Makran accretionary wedge of northern Indian Ocean. The comprehensive analysis results show that the sedimentary strata in the study area are mainly composed of the upper and lower parts, among which the lower hemipelagic muddy strata have the characteristics of “east thick and west thin”, while the upper coarse Makran sand strata have the characteristics of high speed deposition. The characteristics of density inversion and high sedimentary rate provide the material basis for the formation of mud diapir or mud volcano. In Makran accretionary wedge, the convergence rate between Arabian plate and Eurasian plate is characterized by “east fast and west slow”, moreover, the strike slip faults and mud volcanoes developed on both sides of the east and west. Considering the convergence rate of the Mediterranean Sea Ridge with the same low subduction angle and the distribution characteristics of mud volcanoes, it is considered that the mud volcanoes on both sides of the east and west are mainly controlled by strike slip faults, while the mud volcanoes in the accretionary wedge are mainly controlled by the convergence rate, thrust faults and density inversion, showing the characteristics of “the East mud volcanoes are more than the West”. |
| |
| Keywords: | sedimentary feature convergence rate mud volcano main controlling factor Makran accretionary wedge |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《现代地质》浏览原始摘要信息 |
| 点击此处可从《现代地质》下载免费的PDF全文 |
|
