地质学报（英文版）2000，Vol.74Issue(2)：207-212,6.
Basement Characteristics and Crustal Evolution of the Copper-Gold Metallogenic Belt in the Middle and Lower Reaches of the Yangtze River: Some Isotope Constraints
Basement Characteristics and Crustal Evolution of the Copper-Gold Metallogenic Belt in the Middle and Lower Reaches of the Yangtze River: Some Isotope Constraints
摘要
Abstract
Studies of the Pb, Sr and Nd isotopic composition of Mesozoic intrusive rocks indicate that the basement of the copper-gold metallogenic belt of the middle and lower reaches of the Yangtze River has "two-layer structure" and partly has "multi-layered structure", and is inhomogeneous and shows the distinct feature of E-W provincialism. The calculated model lead ages (t1) are mostly greater than 2600 Ma, and the model neodymium ages (TDM) vary from 953 to 2276 Ma and concentrate in two time intervals: 1800- 2000 Ma and 1200- 1600 Ma. It is concluded that the basement of the MBYR is composed of the Late Archaeozoic to Middle Proterozoic metamorphic series and that the crust was initiated in the Archaean and continued to grow in the Early and Middle Proterozoic, and the proportion of new crust formed by mantle differentiation during the Late Proterozoic is low.关键词
basement/crustal age/Pb/Sr and Nd isotopes/metallogenic belt of the middle and lower reaches of the Yangtze RiverKey words
basement/crustal age/Pb/Sr and Nd isotopes/metallogenic belt of the middle and lower reaches of the Yangtze River分类
天文与地球科学引用本文复制引用
..Basement Characteristics and Crustal Evolution of the Copper-Gold Metallogenic Belt in the Middle and Lower Reaches of the Yangtze River: Some Isotope Constraints[J].地质学报（英文版）,2000,74(2):207-212,6.基金项目
This study was supported by the National Natural Science Foundation of China grant 49802007. （）
