Geochronological problems related to polymetamorphism in the Limpopo Complex, South Africa

被引：59
|
作者：
Van Reenen, D. D. [1 ]
Boshoff, R. [1 ]
Smit, C. A. [1 ]
Perchuk, L. L. [1 ,2 ,3 ]
Kramers, J. D. [4 ]
McCourt, S. [5 ]
Armstrong, R. A. [6 ]
机构：
[1] Univ Johannesburg, Dept Geol, ZA-2006 Johannesburg, South Africa
[2] Moscow MV Lomonosov State Univ, Geol Fac, Dept Petrol, Moscow 119899, Russia
[3] Russian Acad Sci, Inst Expt Mineral, Chernogolovka 142432, Moscow District, Russia
[4] Univ Bern, Isotope Lab Geol, Bern, Switzerland
[5] Univ KwaZulu Natal Durban, Sch Geol Sci, Durban, South Africa
[6] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
来源：
GONDWANA RESEARCH | 2008年 / 14卷 / 04期
关键词：
Limpopo high-grade terrain; PbSL and U-Pb age dating; Polymetamorphic granulites; High-temperature shear zones; Southern Africa;
D O I：
10.1016/j.gr.2008.01.013
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The integration of new and published geochronologic data with structural, magmatic/anatectic and pressure-temperature (P-T) process information allow the recognition of high-grade polymetamorphic granulites and associated high-grade shear zones in the Central Zone (CZ) of the Limpopo high-grade terrain in South Africa. Together, these two important features reflect a major high-grade D-3/M-3 event at similar to 2.02 Ga that overprinted the >2.63 Ga high-grade Neoarchaean D-2/M-2 event, characterized by SW-plunging sheath folds. These major D-2/M-2 folds developed before similar to 2.63 Ga based on U-Pb zircon age data for precursors to leucocratic anatectic gneisses that cut the high-grade gneissic fabric. The D3/M3 shear event is accurately dated by U-Pb monazite (2017.1 +/- 2.8 Ma) and PbSL garnet (2023 +/- 11 Ma) age data obtained from syntectonic anatectic material, and from sheared metapelitic gneisses that were completely reworked during the high-grade shear event. The shear event was preceded by isobaric heating (P=similar to 6 kbar and T=similar to 670-780 degrees C), which resulted in the widespread formation of polymetamorphic granulites. Many efforts to date high-grade gneisses from the CZ using PbSL garnet dating resulted in a large spread of ages (similar to 2.0-2.6 Ga) that reflect the polymetamorphic nature of these complexly deformed high-grade rocks. (C) 2008 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
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收藏
页码：644 / 662
页数：19
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