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Геодинамика и тектонофизика

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SHORT EPISODES OF CRUST GENERATION DURING PROTRACTED ACCRETIONARY PROCESSES: EVIDENCE FROM CENTRAL ASIAN OROGENIC BELT, NW CHINA

https://doi.org/10.5800/GT-2017-8-3-0294

Полный текст:

Аннотация

Accretionary orogens are major sites of generation of continental crust but the spatial and temporal distribution of crust generation within individual orogens remains poorly constrained. Paleozoic (~540–270 Ma) granitic rocks from the Alati, Junggar and Chinese Tianshan segments of the Central Asian Orogenic Belt (CAOB) have markedly bimodal age frequency distributions with peaks of ages at ~400 Ma and 280 Ma for the Altai segment, and ~430 Ma and 300 Ma for the Junggar and Chinese Tianshan segments. Most of the magma was generated in short time intervals (~20–40 Ma), and variations in magma volumes and in Nd–Hf isotope ratios are taken to reflect variable rates of new crust generation within a long-lived convergent plate setting.

Об авторах

Gong-Jian Tang
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences; CAS Center for Excellence in Tibetan Plateau Earth Sciences (CETES)
Китай

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640;

Beijing



Sun-Lin Chung
National Taiwan University
Тайвань

Department of Geosciences, 

Taipei



Chris J. Hawkesworth
University of St. Andrews; University of Bristol
Великобритания

Department of Earth Sciences, St. Andrews Fife KY16 9AL;

Department of Earth Sciences, Bristol BS8 1RJ



P. A. Cawood
University of St. Andrews; Monash University
Великобритания

Department of Earth Sciences, St. Andrews Fife KY16 9AL;

6 School of Earth, Atmosphere & Environment, Melbourne, VIC 3800



Qiang Wang
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences; CAS Center for Excellence in Tibetan Plateau Earth Sciences (CETES)
Китай

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640;

Beijing



Derek A. Wyman
The University of Sydney
Австралия
School of Geosciences, Sydney, NSW 2006


Yi-Gang Xu
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
Китай
State Key Laboratory of Isotope Geochemistry, Guangzhou 510640


Zhen-Hua Zhao
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
Китай
State Key Laboratory of Isotope Geochemistry, Guangzhou 510640


Для цитирования:


Tang G., Chung S., Hawkesworth C., Cawood P.A., Wang Q., Wyman D., Xu Y., Zhao Z. SHORT EPISODES OF CRUST GENERATION DURING PROTRACTED ACCRETIONARY PROCESSES: EVIDENCE FROM CENTRAL ASIAN OROGENIC BELT, NW CHINA. Геодинамика и тектонофизика. 2017;8(3):573-574. https://doi.org/10.5800/GT-2017-8-3-0294

For citation:


Tang G., Chung S., Hawkesworth C., Cawood P.A., Wang Q., Wyman D., Xu Y., Zhao Z. SHORT EPISODES OF CRUST GENERATION DURING PROTRACTED ACCRETIONARY PROCESSES: EVIDENCE FROM CENTRAL ASIAN OROGENIC BELT, NW CHINA. Geodynamics & Tectonophysics. 2017;8(3):573-574. https://doi.org/10.5800/GT-2017-8-3-0294

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ISSN 2078-502X (Online)