Site U1457

Pandey, Dhananjai K.; Clift, Peter D.; Kulhanek, Denise K.; Andó, Sergio; Bendle, James; Bratenkov, Sophia; Griffith, Elizabeth M.; Gurumurthy, G P; Hahn, Annette; Iwai, Masao; Khim, Boo Keun; Kumar, Anil; Liddy, Hannah M.; Lu, Huayu; Lyle, Mitchell W; Mishra, Ravi; Radhakrishna, T.; Routledge, Claire M.; Saraswat, Rajeev; Saxena, R. K.; Scardia, Giancarlo; Sharma, Girish Kumar; Singh, Arun D.; Steinke, Stephan; Suzuki, Kenta; Tauxe, Lisa; Tiwari, Manish; Xu, Zuyan; Yu, Zhaojie

doi:10.14379/iodp.proc.355.104.2016

Cited by 15 publications

(35 citation statements)

References 102 publications

(121 reference statements)

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“…Further, study carried out by Planke (1994) using wire line log at Ocean Drilling Program Site 642 located on Voring volcanic margin off Norway revealed tholeiitic lava flow (flood basalt) representing SDRs. Litholog of drilled site in IODP Leg 355 U1457 in the Laxmi basin also shows the presence of basaltic lava flow underlying the Paleocene sediment at depth of ∼1100 m below seafloor (Pandey et al 2016). These results support our interpretation of occurrence of flood basalt immediately below the sedimentary strata on the NWCMI.…”

Section: Extent and Thickness Of Flood Basaltsupporting

confidence: 83%

“…They also proposed that Panikkar ridge is a basaltic volcanic body derived from melting of lower part of the SCM. Results of the drilling at site U1457 in the Laxmi basin during International Ocean Discovery Program (Expedition 355) recovered 8.72 m of basalt, as well as associated volcaniclastic sediment above it (Pandey et al 2016). Shore-based geochemical analysis carried out after the end of the expedition shows that the basalt is Mg-rich, low-K sub-alkalic tholeiites.…”

Section: Resultsmentioning

confidence: 99%

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Extension of flood basalt on the northwestern continental margin of India

Kumar

Chaubey

2019

J Earth Syst Sci

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The Deccan Continental Flood Basalt (DCFB) in central western India is a large igneous province that covers almost one-sixth area of India. It is erupted in less than 1 million years during the magnetic chron 29 r (∼65.6-64.8 Ma) through the Cretaceous-Tertiary boundary. It is believed that nearly an equivalent area of flood basalt, adjoining the DCFB, is submerged on the northwestern continental margin of India (NWCMI). Onshore information on the DCFB is widely reported in geological and geophysical studies. However, knowledge on the offshore extent of flood basalt is poorly known because of paucity of marine geophysical data and lack of an appropriate approach to determine the flood basalt. To fill this gap in knowledge, P-wave velocity in flood basalt as a proxy, drilled wells results, and published seaward dipping reflectors are used to delineate flood basalt extent on the NWCMI. The results of the study reveal that P-wave velocity in the flood basalt varies from 4.1 to 5.2 km/s. Apart from some isolated basement-high features, it is found that flood basalt lies below sediment and carpets the entire NWCMI extending up to the Laxmi-Laccadive ridges. The depth of occurrence of flood basalt ranges from 800 to 7400 m, with a maximum thickness of ∼3900 m in the eastern part of the Laxmi basin. The article presents preliminary results about the extension of flood basalt on the western continental margin of India which may be useful for researchers and Indian oil industries planning exploration activities in Mesozoic sediment of the margin for hydrocarbon prospects.

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Section: Extent and Thickness Of Flood Basaltsupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Extension of flood basalt on the northwestern continental margin of India

Kumar

Chaubey

2019

J Earth Syst Sci

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“…. a) Lithostratigraphy for U1457 modified fromPandey et al (2016) in meters composite depth (CCSF). b) Age model fromRoutledge et al (2019).…”

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confidence: 99%

A Reassessment of the Chronostratigraphy of Late Miocene C₃–C₄ Transitions

Tauxe

Feakins

2020

Paleoceanog and Paleoclimatol

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• A change from forest to grassland ecologies began in the late Miocene but chronologies of the published records are based on different time scales. • Recalibration to a consistent time scale demonstrates the diachroneity of the ecological change in different places around the globe. • New constraints link a major C 4 expansion in the late Miocene with evidence for carbon cycle perturbations.

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“…The Seychelles-LR separation is considered as contemporaneous to Deccan volcanism (~68.5–60 Ma with peak magmatic activity around ~65 Ma) when the Reunion hotspot impinged beneath a waning Indian lithosphere 3,4,13 . However, accurate estimates of the extent of offshore Deccan volcanism also remains elusive 26 . Highly complex northward journey of India at ~80–65 Ma produced numerous enigmatic structures along its western passive margin, e.g., the Laxmi basin (LB), Gop rift and numerous seamounts 13,14,20,21 (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Grey circles with numbers mark locations of refraction seismic experiments 6 . Expedition 355 26 sites (U1456 and U1457) are marked in red colour. Magnetic lineations in Laxmi basin 18 are shown on the map (white broken lines)…”

Section: Introductionmentioning

confidence: 99%

Relict subduction initiation along a passive margin in the northwest Indian Ocean

Pandey

Whattam

2019

Nat Commun

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The tectonic evolution of Laxmi basin, presently located along western Indian passive margin, remains debated. Prevailing geodynamic models of Laxmi basin include two mutually competing hypotheses, culminating in either a hyper-stretched continental crust or an oceanic crust overlying an extinct spreading centre. The longstanding conundrum surrounding its precise crustal affinity precludes a complete understanding of the early opening of the Indian Ocean. Here, we present distinct geochemical and geophysical imprints from the igneous crust in Laxmi basin obtained through International Ocean Discovery Program Expedition 355. The geochemical and isotopic signatures of the Laxmi basin crust exhibit uncanny similarities with forearc tectonic settings. Our observations imply a relict subduction initiation event occurred in the Laxmi basin in the Late Cretaceous-Early Cenozoic that marks a significant Cenozoic plate reorganisation record in the northwest Indian Ocean. New findings therefore warrant re-evaluation of the Gondwana breakup to account for the nascent subduction in the northwest Indian Ocean.

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Site U1457

Abstract: Background and objectives 4 Operations 9 Lithostratigraphy 19 Biostratigraphy 23 Stratigraphic correlation 26 Igneous petrology 30 Geochemistry 35 Microbiology 37 Paleomagnetism and rock magnetism 41 Physical properties 45 Downhole measurements 46 References 222 223

Cited by 15 publications

References 102 publications

Extension of flood basalt on the northwestern continental margin of India

Extension of flood basalt on the northwestern continental margin of India

A Reassessment of the Chronostratigraphy of Late Miocene C₃–C₄ Transitions

Relict subduction initiation along a passive margin in the northwest Indian Ocean

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Site U1457

Abstract: Background and objectives 4 Operations 9 Lithostratigraphy 19 Biostratigraphy 23 Stratigraphic correlation 26 Igneous petrology 30 Geochemistry 35 Microbiology 37 Paleomagnetism and rock magnetism 41 Physical properties 45 Downhole measurements 46 References 222 223

Cited by 15 publications

References 102 publications

Extension of flood basalt on the northwestern continental margin of India

Extension of flood basalt on the northwestern continental margin of India

A Reassessment of the Chronostratigraphy of Late Miocene C3–C4 Transitions

Relict subduction initiation along a passive margin in the northwest Indian Ocean

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A Reassessment of the Chronostratigraphy of Late Miocene C₃–C₄ Transitions