大别山北淮阳构造带柳林辉长岩:新元古代晚期裂解事件的记录

陈玲; 马昌前; 佘振兵; 张金阳; 周红升; 王琳燕

大别山北淮阳构造带柳林辉长岩:新元古代晚期裂解事件的记录

陈玲¹,
马昌前^{1, 2, ,},
佘振兵¹,
张金阳¹,
周红升³,
王琳燕¹

1.
中国地质大学地球科学学院，湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室，湖北武汉 430074
3.
信阳师范学院城市与环境科学系，河南信阳 464000

基金项目:

国家自然科学基金重点项目 40334037

详细信息

作者简介:
陈玲(1982一)，女，矿物学岩石学专业硕士研究生

通讯作者:
马昌前, Email: cqma@cug.edu.cn

中图分类号: P588.12
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- 文章访问数: 3639
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- 被引次数: 0
出版历程
- 收稿日期: 2005-12-26
- 刊出日期: 2006-07-25

Liulin Gabbro in the Beihuaiyang Tectonic Belt of the Dabie Orogen: A Witness of the Late Neoproterozoic Rifting Event

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China Urtiversity of Geosciences, Wuhan 430074, China
3.
Department of City and Environmental Science, Xinyang Normal University, Xinyang 464000, China

摘要

摘要: 大别山北坡北淮阳构造带的柳林-定远-王母观一线, 断续分布着带状产出的辉长岩体, 构成一条NWW向的基性岩带, 以往被认为是形成于海西期的造山后伸展环境.对该带西缘鸡公山北坡柳林辉长岩进行了锆石SHRIMPU-Pb定年和辉石、斜长石的矿物化学研究.辉长岩中的岩浆锆石SHRIMPU-Pb年龄为(611±13) Ma, 代表岩体结晶时代, 这一年龄远远老于其围岩上奥陶统定远组的时代.岩体主要矿物辉石属普通辉石, Na₂O、FeO和MnO较高, 长石属中长石, 低CaO, 这些特征明显区别于岛弧或活动大陆边缘环境中的同类矿物, 而与板内伸展环境中形成的辉长岩的矿物特征相似.研究表明, 大别山北部新元古代晚期(610Ma左右) 发育了一次陆内裂解事件.
- 辉长岩 /
- 锆石SHRIMPU-Pb定年 /
- 新元古代裂解事件 /
- 大别造山带
Abstract: A number of gabbric plutons discontinuously crop out along the Liulin-Dingyuan-Wangmuguan region in the Beihuaiyang tectonic belt of north Dabie. They were previously considered to have been developed in a post-orogenic extensional setting. In this paper we present new data of zircon SHRIMP dating and EPMA chemical analysis results of pyroxenes and plagioclases from the Liulin gabbro at the northern foot of Jigongshan Mountain. SHRIMP U-Pb dating on magmatic zircons yielded an age of (611±13) Ma, which is interpreted as the crystallization time of the Liulin gabbro. The date is significantly older than the immediately adjacent Upper Ordovician Dingyuan Formation, revising the contact relationship between the gabbro body and its wall rock. Pyroxene is exclusively augite with high Na₂O, FeO and MnO contents, and plagioclase is low CaO andesine, which share characteristics with their counterparts from gabbros formed in an intra-plate setting and are largely different from those from gabbros associated with island arc or active continental margin. The results indicate that there may have been a continental rifting event in the north of the Dabie orogen during the late Neoproterozoic period.
- gabbro /
- zircon SHRIMP U-Pb dating /
- Neoproterozoic rifting event /
- Dabie orogen

HTML全文

图 1 大别山北淮阳构造带基性侵入岩分布地质简图

Pzn.古生代南湾组; Pzd.古生代定远组; Pzh.古生代浒湾组; γ5³.燕山期花岗岩; K.白垩系; Q.第四系

Fig. 1. Geological sketch map of mafic intrusive rocks in the Beihuaiyang tectonic belt, Dabie orogen

下载: 全尺寸图片幻灯片

图 2 柳林辉长岩体中辉石的Q-J (a) 和Wo-En-Fs (b) 图解

Quad-Ca-Mg-Fe辉石类; Ca-Na-Ca-Na辉石类; Na-Na辉石类

Fig. 2. Q-J (a) and Wo-En-Fs (b) diagrams for the pyroxenes from Liulin gabbro

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图 3 柳林辉长岩(04-167-2) 锆石SHRIMP U-Pb年龄谐和图

Fig. 3. Zircon SHRIMP U-Pb concordia diagram for Liulin gabbro (04-167-2)

下载: 全尺寸图片幻灯片

图 4 柳林辉长岩单斜辉石SiO₂-Al₂O₃和SiO₂-TiO₂图解

a.单斜辉石SiO₂-Al₂O₃图解(Le Bas, 1962); b.单斜辉石SiO₂-TiO₂图解(Nisbet and Pearce, 1977; 倪志耀, 1994); S.亚碱性岩; A.碱性岩; P.过碱性岩; OFB.洋底玄武岩; VAB.火山弧玄武岩

Fig. 4. SiO₂ versus Al₂O₃ and SiO₂ versus TiO₂ diagrams of clinopyroxenes from Liulin gabbro

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图 5 柳林辉长岩单斜辉石F1-F2图解(Nisbet and Pearce, 1977)

WPT.板块内部拉斑玄武岩; WPA.板块内部碱性玄武岩; VAB.火山弧玄武岩; OFB.洋底玄武岩

Fig. 5. F1 versus F2 diagram of clinopyroxenes from Liulin gabbro

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表 1 柳林辉长岩辉石和斜长石电子探针化学成分

Table 1. EPMA chemical compositions of the pyroxenes and plagioclases from Liulin gabbro

表 2 柳林辉长岩锆石SHRIMP U-Pb定年结果

Table 2. Zircon SHRIMP U-Pb data of Liulin gabbro

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