郯庐断裂系统与中国东部幔源岩浆成因CO_2关系的初探

中国已发现的幔源岩浆成因CO2气藏主要分布在与郯庐断裂发育密切相关的东部伸展盆地，两者关系具体表现如下：1．中国东部幔源岩浆成因CO2气藏的空间展布与郯庐断裂保持一致；2．郯庐断裂切割深度达到上地幔；3．沿郯庐断裂岩浆活动强烈，且具幔源特点；4．中国东部伸展盆地自中、新生代以来的演化受郯庐断裂带活动影响。本文主要以郯庐断裂带为主线，结合幔源岩浆成因CO2气藏典型实例，从郯庐断裂构造环境、空间格局和演化过程对幔源岩浆成因CO2的控制作用进行初步归纳和分析。

A PRIMARY STUDY ON THE RELATIONSHIP BETWEEN THE TANCHENG-LUJIANG FAULT SYSTEM AND MANTLE-DERIVED MAGMATOGENETIC CO_2 IN EAST CHINA

Mantle-derived magmatogenetic CO2 gas reservoirs have been found in China, which are distribut-ed mainly in eastern extensional basins related to the Tancheng-Lujiang fault system. Their relation-ship is actually reflected in the following aspects: first, the spatial distribution of mantle-derived meg-matogenetic carbon dioxide gas reservoirs in East China accords with the Tancheng-Lujiang fault; sec-ond, the fault extends so deeply as to reach the upper mantle; third, the activities of mantle-derivedmagma occurred frequently along the fault; and fourth, the evolution of the extensional basins in EastChina was infiuenced by the activities of the fault during Mesozoic-Cenozoic time.This paper preliminarily summarizes and analyzes the tectonic setting, spatial distribution andevolution of the Tancheng-Lujiang fault system, as well as its control on the mantle-derived magmato-genetic CO2 in terms of the Tancheng-Lujiang fault itself and some typical gas reservoirs.