长江中下游及邻区的地壳密度结构及深部成矿背景探讨——来自重力学的约束.pdfVIP

1000-0569 /2014 /030( 04) -0931-40 Acta Petrologica Sinica 岩石学报 长江中下游及邻区的地壳密度结构与深部成矿背景探 * — 讨 —— 来自重力学的约束 1 1 2 2 2 张永谦 吕庆田 滕吉文 王谦身 徐涛 ZHANG YongQian1 ，L QingTian1 ，TENG JiWen2 ，WANG QianShen2 and XU Tao2 1． 中国地质科 ， ， 100037 学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室 北京 2． ， 100029 中国科学院地质与地球物理研究所 北京 1. Key Laboratory of Metallogency and Mineral Assessment ，MLＲ ，Institute of Mineral Ｒesources ，Chinese Academy of Geological Sciences ，Beijing 100037 ， China 2. Institute of Geology and Geophysics ，Chinese Academy of Sciences ，Beijing 100029 ，China 2013-11-08 收稿 ，2014-02-07 改回 . Zhang YQ ，Lü QT ，Teng JW ，Wang QS and Xu T. 2014. Discussion on the crustal density structure and deep mineralization background in the Middle-Lower Yangtze metallogenic belt and its surrounding areas :Constraints from the :931 － 940 gravity inversion. Acta Petrologica Sinica ，30 (4) Abstract To further understand the deep tectonic background and the magma activities as well as the deep mineralization processes in the Middle-Lower Yangtze metallogenic belt ，we construct the 2D crustal density structure model based on the gravity data collected along the Lixin-Yixing geophysical profile in direction of NW-SE. We discuss the deep tectonic framework and mineralization processes on the view points of Moho undulation ，characteristics of densities distribution and exist of low-density zones in crust based on the density model we got. The research results show that :the density structure varies strongly beneath the Lixin-Yixing profile ;the Moho interface shallows by 3km beneath the Ningwu ore concentration area and shows an uplift form ;there exists low