| 福建同安角闪辉长岩的矿物化学、40Ar-39Ar年龄及地质意义 |
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| 引用本文： | 陈荣,周金城.福建同安角闪辉长岩的矿物化学、40Ar-39Ar年龄及地质意义[J].地质论评,2001,47(6):602-607. |
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| 作者姓名： | 陈荣 周金城 |
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| 作者单位： | 南京大学地球科学系, |
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| 基金项目： | 本文为国家自然科学基金(编号49572098,49632080)资助项目成果之一.工福建省地质局,1 977.泉州幅、厦门幅区域地质调查报告(1:20万). |
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| 摘 要： | 福建同安角闪辉长岩的岩石化学成分具有低MgO高铝玄武岩的特征,其中的角闪石是富钙钙镁闪石,斜长石是An=91～95的钙长石.在基性的弧岩浆中,低MgO高铝玄武岩浆富水是导致结晶出高钙斜长石的关键因素.钙镁闪石的40Ar-39Ar年龄为129.62±0.15 Ma,说明同安角闪辉长岩是东南沿海早白垩世"初始引张阶段"岩浆活动的产物.
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| 关 键 词： | 40Ar-39Ar年龄 矿物化学 角闪辉长岩 同安 福律 |
| 修稿时间： | 2001年3月13日 |
Mineral Chemistry and ~(40)Ar-~(39)Ar Ages of Hornblende Gabbro from Tong'an,Fujian Province and Their Geological Significance |
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| CHEN Rong,ZHOU Jincheng.Mineral Chemistry and ~(40)Ar-~(39)Ar Ages of Hornblende Gabbro from Tong'an,Fujian Province and Their Geological Significance[J].Geological Review,2001,47(6):602-607. |
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| Authors: | CHEN Rong ZHOU Jincheng |
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| Institution: | CHEN Rong,ZHOU JinchengDepartment of Earth Sciences and State Key Laboratory of Mineral Deposit Research,Nanjing University,Nanjing |
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| Abstract: | Petrochemistry of hornblende gabbro from Tong' an of Fujian Province shows typical characteristics of low-MgO and high-alumina basalts. The amphibole in it is calcium-rich tschermakitic hornblende and the plagioclases in it are anorthites (An =91 - 95 ). In basic arc magmas, the high content of H2O content of the low-MgO and high-alumina basaltic magmas leads to crystallization of high-calcium plagioclase. The 40Ar-39Ar age of the tschermakitic hornblende is 129. 620?. 152 Ma. It suggests that hornblende gabbro from Tong'an is the product of magmatic activities of "early extensional stage" during the early Cretaceous in the southeastern coast of China. |
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| Keywords: | 40Ar-39Ar age mineral chemistry hornblende gabbro Tong'an Fujian |
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