U-Pb geochronology of zircons from river sediments in Sri Lanka: Implications on early Archean to late Cambrian magmatism and episodic crustal growth

doi:10.1016/j.jseaes.2018.08.029

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	U-Pb geochronology of zircons from river sediments in Sri Lanka: Implications on early Archean to late Cambrian magmatism and episodic crustal growth
	Malaviarachchi, Sanjeewa P. K.1,2; Bindusara, Subhashani 1; Dharmapriya, Prasanna Lakshitha 1; Su, Ben-Can 3; Su, Li 4; Su, Ben-Xun 5; Zhang, Hong 6; Zhang, Chengli 6; Sajeev, Krishnan 7; Sakyi, Patrick Asamoah 8
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2019-03-01
卷号	171 页码:388-412
关键词	U-Pb geochronology Gondwana River sediment Zircon Sri Lanka
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2018.08.029
英文摘要	Geochronology of zircons from river-sediments in Sri Lanka has never been attempted. Here we present Rare Earth Elements (REE) and U-Pb isotopes of -700 zircon grains by laser ablation ICP-MS technique, from sediments of the major rivers in the Sri Lankan basement (rivers of Mahaweli, Kelani, Kalu, Walawe, Maduru Oya and Maha Oya). Most of the studied zircons display oscillatory zoning and Th/U > 0.1, confirming their igneous origin. U-Pb age distribution of these river-sand zircons exhibits two major populations depicting Mesoproterozoic to Archean ( similar to 30%; > 1100-3100 Ma) and Neoproterozoic to late Cambrian ( similar to 70%; > 430-1000 Ma) magmatism. The two populations could be further resolved into intensive and episodic magmatic peaks at 480-680 Ma, 680-1000 Ma, 1100-1300 Ma, 1300-1700 Ma, 1700-1900 Ma, 2100-2300 Ma, 2300-2600 Ma and 2600-3100 Ma. These river-sediment-zircon data are consistent with the principal episodes of global continental crustal growth and the recognized U-Pb ages of magmatism are mostly correlative with those obtained from basement rocks by previous studies of Sri Lanka. The older zircons found in this study may have mainly originated from reworked/recycled ancient (Palaoproterozoic to Archean) crust. A younger zircon group of 450-700 Ma with homogenous core-rim zoning texture and Th/U ratios < 0.1 were inferred to be of metamorphic origin, indicating their possible crystallization at late Neoproterozoic metamorphic events, associated with the final assembly of the Gondwana Supercontinent. Thus, our data imply that the present-day continental crust of Sri Lanka may have predominantly formed and grown in the Neoproterozoic, while there is evidence that crustal growth began at least in the Paleoproterozoic. Further, the Mesoproterozoic peaks of the frequency distribution of U-Pb ages of river-sand zircons at similar to 1.6 Ga and similar to 1.1 Ga might reflect triggering of subduction in a paleo tectonic setting forming the Wanni and Vijayan dual arc systems, respectively.
资助项目	National Key R&D Program of China[2017YFC0601306] ; National Natural Science Foundation of China[41522203] ; National Research Council of Sri Lanka[NRC-15-089] ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka[MTR/TRD/AGR/3/2/20] ; Department of Science and Technology, India[DSTO/CEAS/SJK/1802]
WOS关键词	QAIDAM UHPM BELT ; DETRITAL ZIRCON ; HIGHLAND COMPLEX ; TRACE-ELEMENT ; LU-HF ; CONTINENTAL-CRUST ; GONDWANA SUPERCONTINENT ; EAST ANTARCTICA ; AGE ; EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000460709300031
资助机构	National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Research Council of Sri Lanka ; National Research Council of Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Department of Science and Technology, India ; Department of Science and Technology, India ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Research Council of Sri Lanka ; National Research Council of Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Department of Science and Technology, India ; Department of Science and Technology, India ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Research Council of Sri Lanka ; National Research Council of Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Department of Science and Technology, India ; Department of Science and Technology, India ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Research Council of Sri Lanka ; National Research Council of Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Indo-Sri Lanka bilateral research project under Ministry of Science, Technology and Research, Sri Lanka ; Department of Science and Technology, India ; Department of Science and Technology, India
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90906]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Malaviarachchi, Sanjeewa P. K.
作者单位	1.Univ Peradeniya, Dept Geol, Fac Sci, Peradeniya 20400, Sri Lanka 2.Niigata Univ, Dept Geol, Fac Sci, Ikarashi 9502181, Japan 3.PetroChina Co Ltd, Changqing Oilfield Co Oil Prod Plant 8, Xian 710000, Shaanxi, Peoples R China 4.China Univ Geosci, Geol Lab Ctr, Beijing 100083, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 6.Northwest Univ, Dept Geol, Key Lab Continental Dynam, Xian, Shaanxi, Peoples R China 7.Indian Inst Sci, Ctr Earth Sci, Bangalore, Karnataka, India 8.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, POB LG 58, Legon, Ghana 9.Adama Sci & Technol Univ, Sch Appl Nat Sci, Appl Geol Dept, POB 1888, Adama, Ethiopia 10.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Malaviarachchi, Sanjeewa P. K.,Bindusara, Subhashani,Dharmapriya, Prasanna Lakshitha,et al. U-Pb geochronology of zircons from river sediments in Sri Lanka: Implications on early Archean to late Cambrian magmatism and episodic crustal growth[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,171:388-412.
APA	Malaviarachchi, Sanjeewa P. K..,Bindusara, Subhashani.,Dharmapriya, Prasanna Lakshitha.,Su, Ben-Can.,Su, Li.,...&Alemayehu, Melesse.(2019).U-Pb geochronology of zircons from river sediments in Sri Lanka: Implications on early Archean to late Cambrian magmatism and episodic crustal growth.JOURNAL OF ASIAN EARTH SCIENCES,171,388-412.
MLA	Malaviarachchi, Sanjeewa P. K.,et al."U-Pb geochronology of zircons from river sediments in Sri Lanka: Implications on early Archean to late Cambrian magmatism and episodic crustal growth".JOURNAL OF ASIAN EARTH SCIENCES 171(2019):388-412.