Paleoseamounts in Yarlung Zangbo suture zone reveal dynamic processes of the Early Cretaceous Neo-Tethys lithosphere

doi:10.1130/B37671.1

NIGPAS OpenIR

	Paleoseamounts in Yarlung Zangbo suture zone reveal dynamic processes of the Early Cretaceous Neo-Tethys lithosphere
通讯作者	Li, Xianghui([email protected])
	Fan, Xiaolong 1; Li, Xianghui 1; Mattern, Frank 2; Li, Xin3 ; Wei, Zhen 4; Zheng, Chenyu 1
	2025
发表期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN	0016-7606
卷号	137 期号:1-2 页码:682-701
摘要	Dynamic processes of the oceanic crust of seamounts trapped in continental sutures are poorly understood. The discovery and analysis of seamount sequences in the Yarlung Zangbo suture zone allowed us to detect vertical lithospheric movements of the eastern Neo-Tethys Ocean. In this study, we used petrological, geochemical, facies, paleontological, and stratigraphic methods to study composite blocks of mafic and sedimentary rocks in the Zhongba area of Xizang, China. Radiolarian fossils indicate an (early) Early Cretaceous age. Petrofacies and geochemistry show that most basalts occur as pillow lava and are enriched in light rare earth elements and high field strength elements, which suggests an oceanic-island basalt tectonic setting. Sedimentary lithofacies are grouped into breccias, shales, cherts, and limestones (ooid and cortoid grainstone microfacies). Three types of contact between basaltic basements and caps were identified as regular, talus, and erosive. These results demonstrate that two more superposed seamounts exist in the western Yarlung Zangbo suture zone than was known previously, and they comprise at least eight seamount sequences of basalts to sediments. Cap lithofacies and seamount textures illustrate that overall, the Zhongba paleo-seamounts record multiple cycles of abrupt deepening to shallowing, with water depth variations of similar to 3000 m to similar to 5 m due to multiple episodes of quick subsidence and uplift of seamounts (lithospheric "ups and downs"). The model of oceanic bypass recurrence and plume rejuvenation is hypoth esized to explain the dynamic subsidence and uplift. While plume activities produced the mafic basement and considerable buoyancy- related lift, oceanic crust bypassed drift, created distance from the plumes, and led to cooling, loss of buoyancy, and rapid subsidence. This model provides a new approach to interpret the evolution of oceanic crusts that have disappeared.
DOI	10.1130/B37671.1
收录类别	SCI
语种	英语
关键词[WOS]	LARGE IGNEOUS PROVINCE ; KERGUELEN MANTLE PLUME ; SOUTHERN TIBET ; SUBDUCTION INITIATION ; TECTONIC EVOLUTION ; VOLCANIC-ROCKS ; GEOCHEMISTRY ; SEAMOUNTS ; OPHIOLITE ; BREAKUP
资助项目	National Natural Science Foundation of China[41872104] ; National Natural Science Foundation of China[42372123] ; Second Tibetan Plateau Scientific Expedition and Research[2019QZKK0706]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001398038100004
项目资助者	National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research
出版者	GEOLOGICAL SOC AMER, INC
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44816
专题	中国科学院南京地质古生物研究所
通讯作者	Li, Xianghui
作者单位	1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, 163 Xianlin Rd, Nanjing 210023, Jiangsu, Peoples R China 2.Sultan Qaboos Univ, Coll Sci, Earth Sci Dept, POB 36, Al Khoud 123, Oman 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China 4.Xinjiang Univ, Sch Geol & Min Engn, Urumqi 830046, Xinjiang, Peoples R China
推荐引用方式 GB/T 7714	Fan, Xiaolong,Li, Xianghui,Mattern, Frank,et al. Paleoseamounts in Yarlung Zangbo suture zone reveal dynamic processes of the Early Cretaceous Neo-Tethys lithosphere[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2025,137(1-2):682-701.
APA	Fan, Xiaolong,Li, Xianghui,Mattern, Frank,Li, Xin,Wei, Zhen,&Zheng, Chenyu.(2025).Paleoseamounts in Yarlung Zangbo suture zone reveal dynamic processes of the Early Cretaceous Neo-Tethys lithosphere.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,137(1-2),682-701.
MLA	Fan, Xiaolong,et al."Paleoseamounts in Yarlung Zangbo suture zone reveal dynamic processes of the Early Cretaceous Neo-Tethys lithosphere".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 137.1-2(2025):682-701.