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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, Subhashani1; Dharmapriya, Prasanna Lakshitha1; Su, Ben-Can3; Su, Li4; Su, Ben-Xun5; Zhang, Hong6; Zhang, Chengli6; Sajeev, Krishnan7; Sakyi, Patrick Asamoah8; Alemayehu, Melesse9,10
2019-03-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume171Pages:388-412
AbstractGeochronology 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.
KeywordU-Pb geochronology Gondwana River sediment Zircon Sri Lanka
DOI10.1016/j.jseaes.2018.08.029
Funding OrganizationNational 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
WOS KeywordQAIDAM UHPM BELT ; DETRITAL ZIRCON ; HIGHLAND COMPLEX ; TRACE-ELEMENT ; LU-HF ; CONTINENTAL-CRUST ; GONDWANA SUPERCONTINENT ; EAST ANTARCTICA ; AGE ; EVOLUTION
Language英语
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000460709300031
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90906
Collection矿产资源研究院重点实验室
Corresponding AuthorMalaviarachchi, Sanjeewa P. K.
Affiliation1.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
Recommended Citation
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.
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