| 安徽铜陵狮子山矿田岩浆岩地球化学特征及成因机制探讨 |
| |
| 引用本文： | 黄顺生,徐兆文,顾连兴,华明,陆现彩,陆建军,聂桂平,朱士鹏.安徽铜陵狮子山矿田岩浆岩地球化学特征及成因机制探讨[J].高校地质学报,2004,10(2):217-226. |
| |
| 作者姓名： | 黄顺生 徐兆文 顾连兴 华明 陆现彩 陆建军 聂桂平 朱士鹏 |
| |
| 作者单位： | 1. 南京大学内生金属矿床成矿机制研究国家重点实验室地球科学系，南京 210093; 2. 江苏省地质调查研究院，南京 210018 |
| |
| 基金项目： | 国家自然科学基金项目 (编号 :4 98730 16 )，高等学校博士点专项科研基金 (编号 :2 0 0 2 0 2 84 0 35 )资助 |
| |
| 摘 要： | 狮子山矿田内分布着一系列燕山期岩浆岩，岩性主要为辉石闪长岩、石英闪长岩和花岗闪长岩。通过岩相学和地球化学研究，表明它们属富碱高钾钙碱性岩系，并有类似高Ba—Sr花岗岩的地球化学特征(如Ba，Sr和LREE含量高，Y和HREE含量较低，LREE／HREE强烈分离，Nb，Ta，Ti强烈亏损，无明显的Eu负异常，Sr—Nd同位素具有EMⅠ型特征)，由此推断它们具有相同岩浆来源。在区域拉张一伸展构造域中，由富集Ba，Sr的基性岩浆底侵熔融下地壳，并发生了结晶分异作用。
|
| 关 键 词： | 狮子山矿田 闪长质侵入体 地球化学 拉张-伸展构造背景 成因机制 |
| 文章编号： | 1006-7493(2004)02-217-10 |
| 修稿时间： | 2002年10月14 |
A Discussion on Geochemical Characteristics and Genesis of Intrusions in Shizishan Orefield,Tongling area,Anhui Province |
| |
| HUANG Shun-sheng ,XU Zhao-wen ,GU Lian-xing ,HUA Ming ,LU Xiancai ,LU Jian-jun ,NIE Guiping ,ZHU Shipeng.A Discussion on Geochemical Characteristics and Genesis of Intrusions in Shizishan Orefield,Tongling area,Anhui Province[J].Geological Journal of China Universities,2004,10(2):217-226. |
| |
| Authors: | HUANG Shun-sheng XU Zhao-wen GU Lian-xing HUA Ming LU Xiancai LU Jian-jun NIE Guiping ZHU Shipeng |
| |
| Institution: | 1. State Key Laboratory for Mineral deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China; 2. Geological Survey of Jiangsu Province, Nanjing 210018, China |
| |
| Abstract: | Baimangshan，Qingshanjiao and Nanhongchong intrusions in the Shizishan orefield，Tongling area，Anhui province，are composed of pyroxene diorite，quartz diorite and granodiorite，respectively． They are predominantly calc-alkine，alkaline-rich，with higher Ba，Sr contents，and share the following similar characteristics with the high Ba-Sr granitoids：higher Ba，Sr and LREE and lower Y and HREE abundances，distinct Nb，Ta and Ti depletion，and absence of negative Sr and Eu anomalies．It is suggested that crystallization differentiation played an important role in evolution of magmas because they have covariant major elements．Fractionation of P-and Ti-bearing accessory minerals，such as apatite，ilmenite and titanite might result in a decrease of P and Ti abundances．The relative depletion in Y and HREE might be caused by hornblende and／or garnet retention，but not intermediate plagioclase in the source．Initial 87Sr／86Sr(0．7062～0．7101)and 143Nd／ 144Nd(0．5116～0．5121)ratios show EM I-type signature, and are negatively correlated．The regional switching from compression to extension in the early Cretaceous in a post-collisional setting might readily trigger a rapid rise of hot Ba-and Sr-enriched upper asthenosphere material and result in widespread melting of lower crust to generate voluminous magmas in the deep-seated magma chamber． |
| |
| Keywords: | Shizishan orefield dioritic intrusions geochemistry extensional setting genetic mechanism |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《高校地质学报》浏览原始摘要信息 |
| 点击此处可从《高校地质学报》下载免费的PDF全文 |
