大别山北部榴辉岩的大地构造属性及冷却史

刘贻灿; 徐树桐; 李曙光; 江来利; 陈冠宝; 吴维平

大别山北部榴辉岩的大地构造属性及冷却史

1.
中国科学技术大学地球与空间科学系, 安徽合肥 230026
2.
安徽省地质调查院，安徽合肥 23000

基金项目:

国家自然科学基金项目 49794041

国家自然科学基金项目 40052002

国家自然科学基金项目 40172079

国家自然科学基金项目 40072070

详细信息

作者简介:
刘贻灿(1962-), 男, 博士, 教授级高级工程师, 主要从事变质岩石学、岩石地球化学、同位素年代学及造山带化学地球动力学研究

中图分类号: P544
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出版历程
- 收稿日期: 2002-05-12
- 刊出日期: 2003-01-25

Tectonic Setting and Cooling History of Eclogites from Northern Dabie Mountains

1.
Department ofEarth and Space Sciences, USTC, Hefei 230026, China
2.
Anhui AcademyofGeologi- cal Survey, Hefei 230001, China

摘要

摘要: 岩石地球化学及同位素年代学研究表明, 大别山北部榴辉岩的大部分属印支期扬子俯冲陆壳(下地壳) 的一部分; 大致沿磨子潭-晓天断裂附近分布的含榴辉岩、大理岩和变质橄榄岩的镁铁-超镁铁质岩带可能代表扬子与华北2个大陆板块之间的变质构造混杂岩带, 它应接近于扬子与华北2个大陆板块之间的缝合线(镁铁-超镁铁质岩带以北), 而五河-水吼剪切带则可能代表扬子俯冲陆壳内部的1条拆离带或滑脱带.冷却史研究表明, 大别山北部榴辉岩峰期变质后初期(2 30~ 2 10Ma) 仅抬升到下地壳水平, 因而未经历降温过程并具有比大别山南部榴辉岩较低的抬升速率, 峰期变质后较慢的抬升速率及相应的近于等温或局部升温阶段也许是造成大别山北部榴辉岩与南部超高压带中榴辉岩差异的重要原因之一; 同时, 也许是研究区榴辉岩很少见有保留早期超高压变质证据的重要原因
- 榴辉岩 /
- 大地构造属性 /
- 冷却史 /
- 大别山北部
Abstract: The petrologic geochemistry and isotopic chronology of the eclogites imply most of the eclogites in the northern Dabie Mountains produced from the Triassic Yangtze subducted continental crust (lower crust formed during the deep subduction) and the metamorphosed mafic-untramafic belt with eclogite, marble and meta-peridotite blocks around the Mozitan-Xiaotian fault zone may represent the meta tectonic melange produced during the active subduction of an ancient oceanic slab and subsequent collision between the Yangtze and North China continental plates. The cooling history of the eclogites from about 900 ℃ to 300 ℃ can be subdivided into three stages: one isothermal stage and two rapid cooling stages. The initial stage during (230±6) Ma and ca 210 Ma was a near-isothermal or temperature rise process corresponding to the retrograded metamorphism of granulite facies with a rapid uplift of about 4 mm/a, then two fast cooling stages occurred with cooling rate of about 10 ℃/Ma (210 Ma to (172±3) Ma) and about 4 ℃/Ma ((172±3) Ma to 130 Ma). After the ultra-high pressure metamorphism of eclogite facies, relatively slower uplift rate and cooling rate and high-T overprinting of granulite facies metamorphism is the major difference of the eclogites in northern Dabie Mountains from those in southern Dabie Mountains.
- eclogite /
- tectonic setting /
- cooling history /
- northern Dabie Mountain.

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图 1 大别山(安徽部分) 地质简图(据刘贻灿等^[17]修改)

Fig. 1. Schematic geological map of the Dabie Mountain orogen in Anhui Province

下载: 全尺寸图片幻灯片

图 2 大别山北部榴辉岩的冷却史和抬升速率

Fig. 2. Cooling history and uplift rate for the eclogites from northern Dabie Mountains

下载: 全尺寸图片幻灯片

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