The Dras arc Complex: lithofacies and reconstruction of a Late Cretaceous oceanic volcanic arc in the Indus Suture Zone, Ladakh Himalaya

Robertson, Alastair H.F.; Degnan, P.

doi:10.1016/0037-0738(94)90057-4

Cited by 72 publications

(84 citation statements)

References 22 publications

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“…Kohistan arc with Eurasia to the north caused a new north-dipping subduction zone to form on the south side of this arc, leading to closure of Tethys and India-Asia collision (Robertson and Degnan 1994;Khan et al 1997). Data presently remain insufficient to resolve whether single or multiple intraoceanic systems are preserved along the suture.…”

Section: Discussionmentioning

confidence: 99%

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Aitchison¹,

McDermid²,

Ali³

et al. 2007

The Journal of Geology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. A B S T R A C TDetailed field mapping combined with a petrologic and geochemical investigation of the Zedong terrane within the Yarlung Tsangpo suture zone provides insights to the evolution of now mostly subducted portions of Tethys during the Late Jurassic. The terrane is dominated by volcanic rocks of shoshonitic affinity, which were erupted in a submarine oceanic island arc setting. The volcanic island arc was built on a basement of oceanic crust, and the shoshonites locally overlie a thin section of pillowed island arc tholeiites and red ribbon-bedded radiolarian cherts. Geochemistry of the shoshonites suggests that their development occurred in a setting analogous to that of Late Miocene to Early Pliocene Fiji and was associated with an arc rifting. We speculate that this event may have been a far-field response to developments associated with Gondwana breakup.

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Section: Discussionmentioning

confidence: 99%

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Aitchison¹,

McDermid²,

Ali³

et al. 2007

The Journal of Geology

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“…4) that, from east to west, include the Nindam volcanoclastic turbidites, Naktul volcanoclastics, and Suru volcanics (Dras 1 and 2), which reach lower greenshchist facies as the basal unit (Clift et al, 2000;Reuber, 1989;Robertson and Degnan, 1994). The orbitoline-dated, Albo-Cenomanian Dras 1 volcaniclastics (Fuchs, 1982) were intruded by…”

Section: Accepted Manuscriptmentioning

confidence: 97%

A tectonic model reconciling evidence for the collisions between India, Eurasia and intra-oceanic arcs of the central-eastern Tethys

et al. 2015

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“…The second group is the Dras Complex, comprising of oceanic crust, calc-alkalic volcanics and an associated fore-arc sequence and accretionary mélange (Reuber, 1989;Cannat and Mascle, 1990;Robertson and Degnan, 1994;Mahéo et al, 2004).…”

Section: Ioia Evidence In Nw India and Pakistanmentioning

confidence: 99%

“…see discussion in Robertson and Degnan, 1994), for the purposes of this study we will focus primarily on constraining the first appearance of any IOIA arc-derived material on the Indian passive margin. We will then discuss the possible links between the KLA, the ISZ ophiolites and the Dras Complex in Section 5.3.…”

Section: Ioia Evidence In Nw India and Pakistanmentioning

confidence: 99%

Detrital chrome spinel evidence for a Neotethyan intra-oceanic island arc collision with India in the Paleocene

Baxter

Aitchison

Ali

et al. 2016

Journal of Asian Earth Sciences

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Models that support a single collision scenario for India and Eurasia are incompatible with the evidence that an intra-oceanic island arc (IOIA) existed within the Neotethyan Ocean. Understanding the spatial and temporal extent of any IOIA is crucial for India-Eurasia collision studies as the entire ocean, including any intraoceanic features, must have been consumed or emplaced prior to continental collision.Here, we review what is known about the Neotethyan IOIA and report evidence from sedimentary successions in NW India and southern Tibet to constrain when and where it was emplaced. We use detrital mineral geochemistry and supporting provenance 2 and age data to identify the source of the sediments and compare the timing of erosion of IOIA-derived material in both regions. Detrital chrome spinels, extracted from distinct sedimentary horizons in southern Tibet (Sangdanlin) and NW India (Ladakh), exhibit similar average geochemical values (TiO 2 = 0.09 and 0.24%, Cr# = 0.66 and 0.68 and Mg# = 0.45 and 0.53, respectively) and supra-subduction zone (SSZ), forearc peridotite signatures. Furthermore, they overlap with in-situ chrome spinels reported from the Spongtang Ophiolite in NW India and the Sangsang Ophiolite in southern Tibet. As with many of the ophiolitic remnants that crop out in and adjacent to the Yarlung-Tsangpo and Indus suture zones (YTSZ and ISZ respectively), the Spongtang and Sangsang ophiolites formed in an IOIA setting. Linking the source of the detrital chrome spinels to those analysed from remnant IOIA massifs in the YTSZ and ISZ is strong evidence for the emplacement of the IOIA onto the Indian margin.The timing of the IOIA collision with India is constrained by the depositional ages of the chrome spinel-bearing sediments to the end of the Paleocene (Thanetian) in southern Tibet and the Early Eocene in NW India. This indirectly provides a maximum age constraint of Late Paleocene-Early Eocene for intercontinental collision between India and Eurasia. Additionally, this study highlights the importance of targeting distinct sedimentary horizons in collision zones to find evidence for discrete tectonic events that may be obfuscated by later collisions.

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The Dras arc Complex: lithofacies and reconstruction of a Late Cretaceous oceanic volcanic arc in the Indus Suture Zone, Ladakh Himalaya

Cited by 72 publications

References 22 publications

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

A tectonic model reconciling evidence for the collisions between India, Eurasia and intra-oceanic arcs of the central-eastern Tethys

Detrital chrome spinel evidence for a Neotethyan intra-oceanic island arc collision with India in the Paleocene

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