苏北踢球山榴辉岩演化的同位素年代学证据

苏北踢球山榴辉岩演化的同位素年代学证据

王银喜1 2, 李惠民1 2, 顾连兴2, 陈道公3, 杨杰东1 2, 沈亚谦1 2, 赵宁曦4, 厉建华5

1. 南京大学现代分析中心，南京 210093; 2. 南京大学内生金属矿床成矿机制研究国家重点实验室，南京 210093; 3. 中国科技大学地球与空间科学系，合肥 230026; 4. 南京大学城市与资源学系，南京 210093; 5. 江苏省第五地质大队，徐州21005

收稿日期:2003-06-20 修回日期:2003-06-20 出版日期:2003-06-20 发布日期:2003-06-20

Evolution 0f Eclogite at Tiquishan，Northern Jiangsu Province：Isotopic Evidence

WANG Yin-xi1 2, LI Hui-ming1 2, GU Lian-xing2, CHEN Dao-gong3, YANG Jie-dong1 2， SHEN Ya-qian1 2, ZHAO Lin-xi4, LI Jian-hua5

1. Center of Modern Analysis, Nanjing University, Nanjing 210093; 2. Stat Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093; 3. Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026; 4. Department of Cities and Resources, Nanjing University, Nanjing 210093; 5. Geoxploration Company No.5, Jiangsu Province, Xuzhou 221005

Received:2003-06-20 Revised:2003-06-20 Online:2003-06-20 Published:2003-06-20

摘要/Abstract

摘要： 采用Sm-Nd同位素定年方法，测得江苏北部新沂地区踢球山三个榴辉岩岩体时代为：221．6±8．4Ma，213、6±9．2Ma和216．6±8．1Ma;εNd(t)分别为-2.9，-2．9和-3．0。采用Rb-Sr定年方法得到其中一个榴辉岩的年龄为201±21Ma；^87Sr／^86Sr＝0．70535±37。Sm-Md年龄被看作为踢球山超高压变质之后板块折返过程中的高压榴辉岩相重结晶阶段年龄。Rb-Sr年龄反映了踢球山榴辉岩体的板块折返过程中的角闪岩相退变质阶段开始年龄。为中朝板块与扬子板块碰撞时代主要发生在晚三叠世的观点提供了依据。

Abstract: Sm-Nd isotope ages of 221.6±8.4 Ma，213.6±9.2 Ma and 216.6±8.1 Ma，respectively，have been obtained for three eclogite bodies in the Tiqiushan region，northern Jiangsu Province．One of the Tiqiushan eclogite bodies is dated by a Rb-Sr isochron at 201±21 Ma．The Sm-Nd age could be interpreted to record recrystallization of the Tiqiushan eclogite body at high pressure eclogite facies during exhumation of the subducted plate，whereas the Rb-Sr age may correspond to initial amphibolite-facies retrograde metamorphism of the same eclogite body．Collision between the Sino-Korean and Yangtze plates occurred around the late Triassic time．

王银喜 , 李惠民 , 顾连兴, 陈道公, 杨杰东 , 沈亚谦 , 赵宁曦, 厉建华. 苏北踢球山榴辉岩演化的同位素年代学证据[J]. J4.

WANG Yin-xi1 2, LI Hui-ming1 2, GU Lian-xing2, CHEN Dao-gong3, YANG Jie-dong1 2， SHEN Ya-qian1 2, ZHAO Lin-xi4, LI Jian-hua5. Evolution 0f Eclogite at Tiquishan，Northern Jiangsu Province：Isotopic Evidence[J]. J4.