大别—苏鲁超高压地体折返过程中岩石组合演化的地球化学约束

杨启军; 钟增球; 周汉文

大别—苏鲁超高压地体折返过程中岩石组合演化的地球化学约束

中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

国家重点基础研究发展规划项目 G1999075506

详细信息

作者简介:
杨启军(1964-), 男, 讲师, 在读博士研究生, 从事变质流变学研究

中图分类号: P588.3;P597
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出版历程
- 收稿日期: 2002-11-25
- 刊出日期: 2003-05-25

Geochemistry Constrains on Rock Association of UHP Terrane during Exhumation

Faculty ofEarth Sciences, China University ofGeosciences, Wuhan 430074, China

摘要

摘要: 大别—苏鲁超高压地体现今的岩石组合是超高压变质岩石经历快速折返过程中各种地质作用叠加改造的最终产物, 其中拆沉、底侵、构造体制转换是改造的动力; 退变质作用、构造置换、深熔作用是改造的主要方式.超高压地体的主要岩石组合有榴辉岩、大理岩、硬玉石英岩、斜长角闪岩、片麻岩和面理化花岗岩.地质、常量、微量、同位素地球化学研究表明, 斜长角闪岩是榴辉岩退变的产物, 片麻岩、面理化花岗岩是榴辉岩退变的斜长角闪岩递进深熔的产物, 即退变榴辉岩折返到中下地壳, 初次熔融产生相当于片麻岩成分的半原地英云闪长质-花岗闪长质-花岗质岩浆, 片麻岩再次熔融产生成分相当于面理化花岗岩的A型花岗岩岩浆.
- 折返 /
- 递进深熔 /
- 岩石组合 /
- 演化 /
- 大别—苏鲁
Abstract: The present rock association of the UHP terrane in Dabie-Sulu region, China results from the result of source UHP rocks rebuilt by retrogressive metamorphism, tectonics, anatexis during the exhumation. The dynamics of reformation is the conversion of tectonics, basal erosion and delimitation by means of metamorphism, structure-replacement and anatexis. The UHP terrane is composed of ecologite, marble, jadeite-quartzite, amphibolites, gneisses and foliated granites. In terms of geology and geochemistry, the amphibolite is found to have evolved from ecologite by retrogressive metamorphism and gneisses, foliated granite to have evolved from the amphibolite by anatexis. The anatexis started at 230 Ma when the UHP terrane exhumed to the low crust and turned intense in the middle-low crust. The melting composition from the anatexis of amphibolite is equal to tantalite or granodiorite (in agreement with gneisses). Moreover, the melt from the partial-melting of gneisses with A-type granite composition (which is the same with the foliated granite). The gneisses and foliated granites have both evolved from ecologite by retrogressive metamorphism and delivery anatexis.
- exhumation /
- delivery anatexis /
- rock association /
- evolution /
- Dabie-Sulu

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图 1 压剪性条件下片麻岩向面理化花岗岩的转变过程

Fig. 1. Transformation from gneiss to foliated granite in press-shear strain

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图 2 石榴石产状的转变过程

1.块状榴辉岩; 2.条带状榴辉岩; 3.变形分解的退变榴辉岩透镜体; 4.片麻岩; 5.面理化花岗岩

Fig. 2. Transition of garnet in Dabie-Sulu UHP terrane

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图 3 榴辉岩及斜长角闪岩原始地幔标准化微量元素模式

Fig. 3. Primary-mantle normalized spider patterns of ecologites and amphibolites in Dabie-Sulu

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图 4 大别—苏鲁面理化花岗岩球粒陨石标准化稀土模式

Fig. 4. Chondrite-normalized REE patterns of foliated granites in Dabie-Sulu

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图 5 面理化花岗岩原始地幔标准化微量元素模式

Fig. 5. Primary-mantle normalized spider patterns of granite in Dabie-Sulu

下载: 全尺寸图片幻灯片

图 6 榴辉岩球粒陨石标准化稀土模式

Fig. 6. Chondrite-normalized REE patterns of ecologites in Dabei-Sulu

下载: 全尺寸图片幻灯片

图 7 片麻岩及斜长角闪岩球粒陨石标准化稀土模式

Fig. 7. Chondrite-normalized REE patterns of the amphibolites and gneisses in Dabei-Sulu

下载: 全尺寸图片幻灯片

图 8 面理化花岗岩球粒陨石标准化稀土模式

Fig. 8. Chondrite-normalized REE patterns of foliated granites in Dabie-Sulu

下载: 全尺寸图片幻灯片

图 9 大别—苏鲁花岗质岩石ε_{Nd, t}-w (¹⁴⁷Sm) /w (¹⁴³Nd) 图

Fig. 9. ε_{Nd, t}-w (¹⁴⁷Sm) /w (¹⁴³Nd) diagram for granite and gneisses in Dabie-Sulu

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表 1 大别—苏鲁超高压地体各岩石单元稀土参数

Table 1. REE parameters of UHP rocks in Dabie-Sulu

表 2 大别—苏鲁超高压地体全岩Sm-Nd同位素比值

Table 2. Whole-rock Sm-Nd isotopic ratios of UHP rocks from Dabie-Sulu

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