浙江龙游石榴石角闪岩(退变榴辉岩): 华夏加里东期碰撞造山事件的新证据
Retrograde garnet amphibolite from eclogite of the Zhejiang Longyou area: New evidence of the Caledonian orogenic event in the Cathaysia block
查看参考文献56篇
|
文摘
|
在华夏地块浙江龙游地区发现了榴辉岩退变形成的石榴石角闪岩, 其变质演化可分为3个阶段, 分别为峰期榴辉岩相阶段(M1), 矿物组合为绿辉石+石榴子石变斑晶(核部)+石英; 峰后后成合晶阶段(M2), 矿物组合为石榴子石变斑晶(边部) +单斜辉石变斑晶+斜长石, 峰期榴辉岩相绿辉石在该阶段形成榴辉岩典型的降压分解结构; 退变质角闪岩相阶段(M3), 矿物组合为角闪石+斜长石, 并在石榴子石边部形成角闪石和斜长石的反应边、后成合晶以及斜长石冠状体. 由于强烈的退变质过程的影响, 传统矿物温压计方法只能得到退变质角闪岩相的温压条件, 获得T=664~691℃, P=0.68~0.73 GPa. 石榴子石成分环带表明该退变榴辉岩在峰后经历了一近等温降压过程. 因此, 结合岩相学分析、石榴子石成分剖面和退变质角闪岩相温压数据,可作出退变质过程的顺时针P-T轨迹, 与碰撞造山过程一致. 故该退变榴辉岩是华夏地块加里东期碰撞造山过程的产物, 是华夏地块加里东期碰撞造山事件的新证据. |
|
其他语种文摘
|
Eclogites are commomly regarded as one of the key indicators of plate convergence and associated orogenesis. In this study we report the discovery of retrograde garnet amphibolite from eclogite of the Longyou area of Zhejiang Province. Detailed petrology reveals a three-stage metamorphic history based on mineral inclusions, reaction textures and pseudomorphs. Peak metamorphism (M1) is defined by high-Ca garnet cores and the presence of omphacite, as indicated by clinopyroxene + plagioclase symplectites. Symplectites of clinopyroxene + plagioclase that pseudomorph omphacite are indicative of the decompression stage (M2). Symplectites of hornblende + plagioclase and the presence of plagioclase coronas around garnet are indicative of formation during cooling (M3), under P-T conditions of P=0.68–0.73 GPa and T=664–691°C. As a result of the intense retrograde metamorphism, only precise P-T conditions of the third stage were determined through conventional thermobarometry while garnet compositional profiles reveal decompression process during its growth. Based on the petrographic textures, garnet compositional profiles and thermobarometry, a clockwise P-T path has been defined, consistent with the occurrence of an orogenic event. Therefore, we suggest that the retrograde garnet amphibolite from eclogite of the Longyou area formed during the the Caledonian collisional orogenic event between the South China Block (amalgmation between Yangtze and Cathaysia in early Neoproterozoic) and an unknown block in the process of these blocks assemblage to eastern Gondwana. |
|
来源
|
科学通报
,2015,60(13):1207-1225 【核心库】
|
|
DOI
|
10.1360/N972015-00094
|
|
关键词
|
石榴石角闪岩
;
退变榴辉岩
;
P-T轨迹
;
华夏地块
;
碰撞造山
|
|
地址
|
1.
中国地质科学院研究生部, 北京, 100037
2.
中国科学院广州地球化学研究所, 广州, 510640
3.
南京地质调查中心, 南京, 210016
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0023-074X |
|
学科
|
地质学 |
|
基金
|
国土资源部中国地质调查局地质调查项目
|
|
文献收藏号
|
CSCD:5445308
|
参考文献 共
56
共3页
|
|
1.
Zhang C L. The Gondwana connection of the South China:Evidence from monazite and zircon geochronology from Cathysia Block.
Gondwana Res,2014
|
被引
2
次
|
|
|
|
|
2.
周新民. 江绍断裂带的岩浆混合作用及其两侧的前寒武纪地质.
中国科学D辑:地球科学,1992,3:296-304
|
被引
2
次
|
|
|
|
|
3.
施央申. 论板块碰撞运动学研究-以江南和东天山造山带为例.
高校地质学报,1995,1:11-21
|
被引
3
次
|
|
|
|
|
4.
高林志. 华南双桥山群和河上镇群凝灰岩中的锆石SHRIMP U—Pb年龄——对江南新元古代造山带演化的制约.
地质通报,2008,27:1744-1751
|
被引
126
次
|
|
|
|
|
5.
洪大卫. 试析杭州—诸广山—花山高ε_(Nd)值花岗岩带的地质意义.
地质通报,2002,21:348-354
|
被引
68
次
|
|
|
|
|
6.
Yao W H. From Rodinia to Gondwana Land:A tale of detrital zircon provenance analyses from the southern Nanhua basin South China.
Am J Sci,2014,314:278-313
|
被引
21
次
|
|
|
|
|
7.
Li X H. Detrital zircon U-Pb age and Hf isotope constrains on the generation and reworking of Precambrian continental crust in the Cathaysia Block, South China:A synthesis.
Gondwana Res,2014,25:1202-1215
|
被引
61
次
|
|
|
|
|
8.
Li Z X. Magmatic and metamorphic events during the early Paleozoic Wuyi-Yunkai orogeny, southeastern South China:New age constraints and pressure-temperature conditions.
GSA Bull,2010,122:772-793
|
被引
188
次
|
|
|
|
|
9.
Li X H. Amalgamation between the Yangtze and Cathaysia blocks in South China:Constraints from SHRIMP U-Pb zircon ages, geochemistry and Nd-Hf isotopes of the Shuangxiwu volcanic rocks.
Precam Res,2009,174:117-128
|
被引
224
次
|
|
|
|
|
10.
Zhao G C. Precambrian geology of China.
Precambrian Res,2012,222/223:13-54
|
被引
277
次
|
|
|
|
|
11.
任纪舜. 论中国南部的大地构造.
地质学报,1990,4:275-289
|
被引
123
次
|
|
|
|
|
12.
水涛. 中国东南边缘大陆古基底构造演化.
科技通报,1987,3:32-35
|
被引
12
次
|
|
|
|
|
13.
Zhao G C. Tectonothermal evolution of the Mayuan assemblage in the Cathaysia block:Implications for Neoproterozoic collision-related assembly of the South China Craton.
Am J Sci,1999,299:309-339
|
被引
78
次
|
|
|
|
|
14.
Li Z X. Assembly, configuration, and break-up history of Rodinia:A synthesis.
Precambrian Res,2008,160:179-210
|
被引
470
次
|
|
|
|
|
15.
Zheng Y F. Introduction to tectonics of China.
Gondwana Res,2013,23:1189-1206
|
被引
170
次
|
|
|
|
|
16.
Cawood P A. Locating South China in Rodinia and Gondwana:A fragment of Greater Indian Lithosphere?.
Geology,2013,41:903-906
|
被引
83
次
|
|
|
|
|
17.
杜杨松. 两广交界地区S型花岗岩中麻粒岩包体的特征和成因.
岩石学报,1999,15:309-314
|
被引
16
次
|
|
|
|
|
18.
Wang Y J. Zircon U-Pb geochronology of gneissic rocks in the Yunkai massif and its implications on the Caledonian event in the South China Block.
Gondwana Res,2007,12:404-416
|
被引
151
次
|
|
|
|
|
19.
Wang Y J. Kwangsian crustal anatexis withinthe eastern South China Block:Geochemical, zircon U-Pb geochronological and Hf isotopic fingerprints from the gneissoid granites of Wugong and Wuyi-Yunkai Domains.
Lithos,2011,127:239-260
|
被引
88
次
|
|
|
|
|
20.
于津海. 南岭东段基底麻粒岩相变质岩的形成时代和原岩性质:锆石的U-Pb-Hf同位素研究.
科学通报,2005,50:1758-1767
|
被引
61
次
|
|
|
|
|
了解气象卫星更多信息，请访问