气候变化领域集成服务门户(CCPortal): New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)

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DOI	10.3389/feart.2022.785726
	New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)
	Li, Zhenyu; Ding, Lin; Laskowski, Andrew K.; Burke, William B.; Chen, Yaofei; Song, Peiping; Yue, Yahui; Xie, Jing
通讯作者	Li, ZY (通讯作者)
发表日期	2022
EISSN	2296-6463
卷号	10
英文摘要	New zircon U-Pb dating results from the Zonggei Formation volcanics indicate that the volcanic rocks formed at similar to 114-110 Ma. Paleomagnetic data, petrography, and rock magnetism confirm the primary nature of isolated characteristic remanent magnetizations carried by titanomagnetite and hematite. A statistical analysis of the combined results from the Zonggei and Duoni formations reveals a group-mean direction of D +/-Delta D = 0.4 degrees +/- 6.0 degrees, I +/-Delta I = 22.2 degrees +/- 5.6 degrees, alpha(95) = 5.6 degrees, k = 35.2 after bedding correction based on 20 group-mean directions. The corresponding paleopole was calculated to be lambda(p) = 70.3 degrees N, phi(p) = 270.5 degrees E with A(95) = 5.2 degrees. The interpretation of our data alongside the Cenozoic data from the Tethyan Himalaya indicates that the India-Asia collision initiated by 61.7 +/- 3.0 Ma at 13.0 degrees +/- 1.8 degrees N, assuming a single-collision model. Intracontinental crustal shortening totaling 1,770 +/- 470 km took place on the Asian side since the onset of India-Asia collision. Furthermore, the data show that the Neo-Tethys Ocean reached its maximum N-S width of 7,100 +/- 530 km at similar to 132 Ma and shrank to 6,400 +/- 550 km by similar to 115 +/- 5 Ma. This is consistent with previous estimates based on the geophysical images of the subducted Neo-Tethyan slab beneath Eurasia.
关键词	INDIA-ASIA COLLISION ZIRCON U-PB HIMALAYAN CARBONATE ROCKS HF ISOTOPIC CONSTRAINTS GAMBA AREA IMPLICATIONS SOUTHERN TIBET VOLCANIC-ROCKS SUTURE ZONE TECTONIC IMPLICATIONS EURASIA COLLISION
英文关键词	Lhasa terrane; India-Asia collision; Neo-Tethys ocean; paleolatitude; geochronology; intracontinental crustal shortening
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000805526100001
来源期刊	FRONTIERS IN EARTH SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260702
推荐引用方式 GB/T 7714	Li, Zhenyu,Ding, Lin,Laskowski, Andrew K.,et al. New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)[J]. 中国科学院青藏高原研究所,2022,10.
APA	Li, Zhenyu.,Ding, Lin.,Laskowski, Andrew K..,Burke, William B..,Chen, Yaofei.,...&Xie, Jing.(2022).New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet).FRONTIERS IN EARTH SCIENCE,10.
MLA	Li, Zhenyu,et al."New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)".FRONTIERS IN EARTH SCIENCE 10(2022).