gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-3-0294gtcrust-435Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSSHORT EPISODES OF CRUST GENERATION DURING PROTRACTED ACCRETIONARY PROCESSES: EVIDENCE FROM CENTRAL ASIAN OROGENIC BELT, NW CHINASHORT EPISODES OF CRUST GENERATION DURING PROTRACTED ACCRETIONARY PROCESSES: EVIDENCE FROM CENTRAL ASIAN OROGENIC BELT, NW CHINATangGong-JianTangGong-Jian

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640;

Beijing

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640;

Beijing

ChungSun-LinChungSun-Lin

Department of Geosciences, 

Taipei

Department of Geosciences, 

Taipei

HawkesworthChris J.HawkesworthChris J.

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

Department of Earth Sciences, Bristol BS8 1RJ

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

Department of Earth Sciences, Bristol BS8 1RJ

CawoodP. A.CawoodP. A.

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

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

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

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

WangQiangWangQiang

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640;

Beijing

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640;

Beijing

WymanDerek A.WymanDerek A.

School of Geosciences, Sydney, NSW 2006

School of Geosciences, 

Sydney, NSW 2006

XuYi-GangXuYi-Gang

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640

State Key Laboratory of Isotope Geochemistry,

Guangzhou 510640

ZhaoZhen-HuaZhaoZhen-Hua

State Key Laboratory of Isotope Geochemistry, Guangzhou 510640

State Key Laboratory of Isotope Geochemistry, 

Guangzhou 510640

Guangzhou Institute of Geochemistry, Chinese Academy of Sciences; CAS Center for Excellence in Tibetan Plateau Earth Sciences (CETES)КитайGuangzhou Institute of Geochemistry, Chinese Academy of Sciences; CAS Center for Excellence in Tibetan Plateau Earth Sciences (CETES)ChinaNational Taiwan UniversityТайваньNational Taiwan UniversityTaiwan, Province of ChinaUniversity of St. Andrews; University of BristolВеликобританияUniversity of St. Andrews; University of BristolUnited KingdomUniversity of St. Andrews; Monash UniversityВеликобританияUniversity of St. Andrews; Monash UniversityUnited KingdomThe University of SydneyАвстралияThe University of SydneyAustraliaGuangzhou Institute of Geochemistry, Chinese Academy of SciencesКитайGuangzhou Institute of Geochemistry, Chinese Academy of SciencesChina20171410201783573574Copyright © Tang G., Chung S., Hawkesworth C., Cawood P.A., Wang Q., Wyman D., Xu Y., Zhao Z., 20172017Tang G., Chung S., Hawkesworth C., Cawood P.A., Wang Q., Wyman D., Xu Y., Zhao Z.Tang G., Chung S., Hawkesworth C., Cawood P.A., Wang Q., Wyman D., Xu Y., Zhao Z.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/435

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.

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.

References

The authors declare that there are no conflicts of interest present.