DOI: 10.1016/j.epsl.2020.116249
论文题名: U-Pb zircon age constraints on the earliest eruptions of the Deccan Large Igneous Province, Malwa Plateau, India
作者: Eddy M.P. ; Schoene B. ; Samperton K.M. ; Keller G. ; Adatte T. ; Khadri S.F.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 540 语种: 英语
中文关键词: Deccan
; K-Pg
; Late Maastrichtian warming event
; U-Pb zircon geochronology
英文关键词: Basalt
; Binary alloys
; Digital storage
; Geochronology
; Mass spectrometers
; Mass spectrometry
; Sedimentary rocks
; Silicate minerals
; Stratigraphy
; Thallium alloys
; Zircon
; Climate instability
; Large igneous provinces
; Large Igneous Provinces (LIPs)
; Paleomagnetic data
; Thermal ionization mass spectrometry
; Thermal metamorphism
; U-pb zircon geochronologies
; Upb zircon age (SHRIMP)
; Lead alloys
; age determination
; basalt
; Deccan Traps
; geochronology
; large igneous province
; Maastrichtian
; petrogenesis
; petrology
; uranium-lead dating
; zircon
; India
; Malwa
; Punjab [India]
英文摘要: Climate instability driven by emission of volatiles during emplacement of large igneous provinces (LIPs) is frequently invoked as a potential cause of mass extinctions. However, documenting this process in the geologic record requires a holistic understanding of eruption rates, the location of eruptive centers, and potential sources of climate-changing volatiles. We present new chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS) U-Pb zircon geochronology from Malwa Plateau basalts on the northern margin of the Deccan LIP, India. These basalts have been previously interpreted as either an extension of the province's main volcanic stratigraphy or as an independent eruptive center active up to millions of years prior to the main eruptive phase. Our data instead demonstrate that the lower Malwa Plateau basalts are temporally correlative with the first pulse of Deccan volcanism and provide new constraints on its initiation and duration. Paleomagnetic data further indicate that upper Malwa Plateau basalts may be age-equivalent to the second, third, and fourth pulses of Deccan volcanism. The relative thicknesses of age-equivalent packages of basalt are consistent with eruption of the Deccan LIP from a southward-migrating eruptive center. The first eruptive pulse is coeval with a ∼200 kyr Late Maastrichtian warming event preserved globally in contemporaneous stratigraphic sections. We propose that the first pulse of Deccan magmatism was more voluminous in the north, where it erupted through organic-rich sedimentary rocks of the Narmada-Tapti rift basin. Thermal metamorphism of these sediments could have been a source of sufficient CO2 to drive the Late Maastrichtian warming event, which if true would reconcile the apparent dampened warming signals associated with later Deccan eruptive pulses. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164953
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, United States; Department of Geosciences, Princeton University, Guyot Hall, Princeton, NJ 08544, United States; Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, United States; Institute of Earth Sciences, University of Lausanne, Géopolis, Lausanne, CH-1015, Switzerland; P.G. Department of Geology, Amravati University, Amravati, 444602, India
Recommended Citation:
Eddy M.P.,Schoene B.,Samperton K.M.,et al. U-Pb zircon age constraints on the earliest eruptions of the Deccan Large Igneous Province, Malwa Plateau, India[J]. Earth and Planetary Science Letters,2020-01-01,540