西南天山超高压变质带的两类石榴角闪岩

吕增; 王凯

doi:10.3799/dqkx.2018.009

Volume 43 Issue 1

Jan. 2018

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Lü Zeng, Wang Kai, 2018. Metamorphic Evolution of Two Types of Garnet Amphibolites from UHP Terrane of Southwestern Tianshan, NW China. Earth Science, 43(1): 150-163. doi: 10.3799/dqkx.2018.009

Citation:

Lü Zeng, Wang Kai, 2018. Metamorphic Evolution of Two Types of Garnet Amphibolites from UHP Terrane of Southwestern Tianshan, NW China. Earth Science, 43(1): 150-163. doi: 10.3799/dqkx.2018.009

Lü Zeng, Wang Kai, 2018. Metamorphic Evolution of Two Types of Garnet Amphibolites from UHP Terrane of Southwestern Tianshan, NW China. Earth Science, 43(1): 150-163. doi: 10.3799/dqkx.2018.009

Citation:

Lü Zeng, Wang Kai, 2018. Metamorphic Evolution of Two Types of Garnet Amphibolites from UHP Terrane of Southwestern Tianshan, NW China. Earth Science, 43(1): 150-163. doi: 10.3799/dqkx.2018.009

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Metamorphic Evolution of Two Types of Garnet Amphibolites from UHP Terrane of Southwestern Tianshan, NW China

doi: 10.3799/dqkx.2018.009

Lü Zeng,
Wang Kai

The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education; School of Earth and Space Sciences, Peking University, Beijing 100871, China

Received Date: 2017-07-10
Publish Date: 2018-01-15

Abstract

Abstract

Amphibolite is one of the common metabasic rock types exposed in the the UHP metamorphic belt of southwestern Tianshan. It is found in the field relationship and mineral reaction textures that most of such amphibolites are retrograded after eclogites or blueschists to various extents at albite-epidote amphibolite facies conditions. However, petrological studies are not systematic and sufficient for those with equilibrated textures from homogeneous blocks. In this paper, it is presented a detailed study of petrography, mineral chemistry and thermodynamic modelling on some albite-free garnet amphibolites in the UHP unit at the lower part of the Habutengsu valley. Results show that they largely consist of green amphibole (Ca-or Na-Ca-amphibole), epidote (or zoisite) and garnet (80% to 90% total volume), substantially different from the equivalents that retrograded from UHP eclogites contain albite porphyroblast. Though these garnet amphibolites are similar in bulk compositions, with high CaO and low Na₂O and high Mg content, based on contrasting differences in terms of texture, structure and mineral assemblage, two types are divided herein. Type Ⅰ garnet amphibolite is quartz-free and relict or inclusion assemblage of Grt+Omp+Lws+Gln+Rt indicating peak lawsonite eclogite facies conditions. Rutile is the only Ti-rich phase as inclusion or in the matrix. Type Ⅱ garnet amphibolite is strongly foliated shown by oriented green amphibole, epidote, chlorite and banded quartz aggregates. Garnet is characterized by bimodal grain size and the larger ones have lower Ca and Mn. No HP indicator such as omphacite or sodic amphibole has been detected. Ti-rich phase is dominated by titanite and rare rutile and ilmenite are only found in some garnets. Generally, garnet compositions are distinguishable between the two types of amphibolites, Type Ⅰ with higher Ca but lower Mg. P-T pseudosection calculations show that peak metamorphic conditions of both types are 480 to 520℃, 30 to 33 kbar, in the UHP field akin to other eclogites in the lower reach of the Habutengsu River and adjacent areas to the west. This indicates a coherent UHP unit extending tens of kilometers along the southern Central Tianshan fault, rather than tectonic mélange from a fossil subduction channel.
- southwestern Tianshan orogenic belt,
- UHP terrane,
- garnet amphibolite,
- phase equilibria modelling,
- metamorphic evolution,
- petrology

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References(68)

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Metamorphic Evolution of Two Types of Garnet Amphibolites from UHP Terrane of Southwestern Tianshan, NW China

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