Provenance of Xigaze fore-arc basin clastic rocks (Cretaceous, south Tibet)

Dürr, Sören B.

doi:10.1130/0016-7606(1996)108<0669:poxfab>2.3.co;2

Cited by 179 publications

(106 citation statements)

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“…[10] North of the YZSZ, sedimentary sequences deposited along the southern margin of Asia consist of the Cretaceous Xigaze Group and Qubeiya Formation and the lower Tertiary Tso-Jiangding Group (Figures 1 and 2) Einsele et al, 1994;Dürr, 1996;Wang et al, 1999]. The Xigaze Group is a >5-km-thick turbidite sequence that was deposited during the middle Cretaceous (110 -84 Ma ).…”

Section: Gangdese Forearcmentioning

confidence: 99%

“…[24] In contrast to the dark gray shale, sandstone, and channel conglomerate of the Xigaze Group exposed in the Xigaze area (Figure 1) Dürr, 1996], the Xigaze Group near Tso-Jiangding consists of green and red shale and sandstone with rare channel conglomerate. We interpret these sequences to be in the upper part of the Xigaze Group.…”

Section: Ding Et Al: Age Of Obduction and Collision Southern Tibetmentioning

confidence: 99%

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Paleocene–Eocene record of ophiolite obduction and initial India‐Asia collision, south central Tibet

2005

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Uppermost Cretaceous to Eocene marine sedimentary sequences occur both to the south and north of the Yarlung Zangbo suture in south central Tibet. They consist of Indian‐margin strata of the northern Tethyan Himalaya and Asian‐margin strata of the Gangdese forearc. Both assemblages are characterized by major changes in depositional environment and sedimentary provenance at ∼65 Ma and an appearance of detrital chromium‐rich spinel of ophiolite affinity (TiO2 generally <0.1 wt%) during the Paleocene. Ophiolitic melange exposed along the suture could have provided a source for detrital spinel. The melange occurs in the hanging wall of a north dipping, south directed mylonitic shear zone which includes a tectonic sliver of mafic schist. Amphibole from the schist yields 40Ar/39Ar ages of ∼63 Ma, which we attribute to cooling during slip along the shear zone and southward obduction of the melange. Melange obduction was coeval with the development of an angular unconformity within the Gangdese forearc basin to the north (between late Maastrichtian time and ∼62 Ma). Upper Paleocene to middle Eocene sandstones in the northern Tethyan Himalaya yield 200–120 Ma U‐Pb detrital zircon ages and 190–170 Ma 40Ar/39Ar detrital mica ages. These detrital grains were most likely sourced from regions north of the Yarlung Zangbo suture, suggesting that onset of India‐Asia collision in south central Tibet is middle Eocene or older in age. Collectively, our results support previous suggestions that oceanic rocks were obducted onto the northern margin of India during latest Cretaceous–earliest Tertiary time. Coeval changes in Gangdese forearc sedimentation raise the possibility that this obduction event marks onset of tectonic interaction between India and Asia at ∼65 Ma. Alternatively, in concert with the conventional view of Eocene collision initiation, the obducted oceanic rocks may be of intraoceanic origin, while coeval changes in Gangdese forearc sedimentation may be a consequence of an increase in the rate of ocean‐continent convergence following the demise of the intraoceanic subduction zone.

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Section: Gangdese Forearcmentioning

confidence: 99%

Section: Ding Et Al: Age Of Obduction and Collision Southern Tibetmentioning

confidence: 99%

Paleocene–Eocene record of ophiolite obduction and initial India‐Asia collision, south central Tibet

2005

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“…The Dagzhuka ophiolite is overlain comformably by forearc sedimentary rocks of the Late Cretaceous (Cenomanian) Xigaze Pearce (1982) and Taylor and McLennan (1985), respectively. Group (XZBGM, 1993;Durr, 1996;Hao et al, 1999). The Xigaze Group consists of flysch sediments deposited on a continental slope or in the Gangdese forearc basin (Wang et al, 1987;XZBGM, 1993;Durr, 1996;Hao et al, 1999;Wang et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

“…Group (XZBGM, 1993;Durr, 1996;Hao et al, 1999). The Xigaze Group consists of flysch sediments deposited on a continental slope or in the Gangdese forearc basin (Wang et al, 1987;XZBGM, 1993;Durr, 1996;Hao et al, 1999;Wang et al, 1999). Both subduction-related melange and blueschists occur on the southern side of the mantle peridotite in the lower part of the ophiolite (Wang et al, 1987).…”

Section: Discussionmentioning

confidence: 99%

Geochemistry and tectonic environment of the Dagzhuka ophiolite in the Yarlung-Zangbo suture zone, Tibet.

Xia

Chen

et al. 2003

Geochem. J.

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The Cretaceous Dagzhuka ophiolite lies in the middle segment of the Yarlung-Zangbo suture zone, Tibet, and has a well-preserved ophiolitic section including a mantle sequence, cumulate complex, diabase dyke swarm and basaltic lavas. Compared to the primitive mantle, tectonized peridotites in the Dagzhuka ophiolite are depleted in Al, Ca, Ti and high field strength elements, but relatively enriched in large ion lithophile elements (Rb, Ba, Th). They have U-shaped, chondrite-normalized REE patterns suggesting an early stage of depletion by partial melting, followed by enrichment from slab-derived fluids. These features support a model in which the mantle peridotites at Dagzhuka formed in a forearc setting. The diabases and basalts are low-K tholeiites depleted in LREE, with compositions similar to N-MORB. However, these rocks are strongly depleted in Nb and Ta but enriched in Th and Rb, features characteristic of island arc lavas. Thus, the Dagzhuka ophiolite is believed to have formed in a supra-subduction zone environment, possibly a fore-arc basin.ophiolite has a well-preserved lithologic sequence ranging from mantle peridotite at the base to pillow lava at the top and thus provides an ideal environment in which to study the evolution of the Tethyan ocean basin (Nicolas et al., 1981;Girardeau et al., 1985;Wang et al., 1987).Although the ophiolite has been studied extensively, there is no agreement as to its origin or tectonic setting. For example, Girardeau et al. (1985) suggested that it formed at mid-oceanic ridge whereas Wang et al. (1999) favored formation in a small, multi-stage oceanic basin. Here we report the results of extensive field and laboratory studies over the past decade and present a new interpretation of the ophiolite. New major and trace element data place important constraints on the tectonic setting of the Dagzhuka ophiolite and suggest that it formed in a supra-subduction zone environment.

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“…To the south of the Lhasa terrane, the Late Cretaceous to Early Tertiary Xigaze fore-arc basin is locally well-preserved within the Indus-Yarlung suture zone ( Fig. 1c; Yin et al, 1994;Durr, 1996). …”

Section: Geological Settingmentioning

confidence: 99%

Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

Yin¹

2017

Appl Ecol Env Res

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Abstract. The Xiongcun district is located in the western segment of the Gangdese porphyry copper belt (GPCB). The No.2 deposit in the Xiongcun district hosts a measured and indicated resource of 1.34 Mt copper, 76.34 t gold, and 193.78 t silver. The copper-gold mineralization of the No.2 deposit is mainly hosted in the Early Jurassic quartz diorite porphyry which intruded volcano-sedimentary rocks of the Early Jurassic Xiongcun Formation. S and Pb isotopic compositions of the ore sulfides and Re contents of molybdenite suggest a mantle source with minor contamination of subducted sediments for the ore-forming materials. Hydrogen and oxygen isotopic compositions of quartz from the quartz -sulfide veins suggest that the ore-forming fluid was a mixture of magmatic and meteoric water. Geochemical and Sr-Nd-Hf isotopic compositions of the Early Jurassic quartz diorite porphyry suggest that the mineralization of the No.2 deposit formed in an intra-oceanic island arc setting. The magmas of the Early Jurassic quartz diorite porphyry were likely sourced from partial melting of mantle with limited contamination by subducted sediments (ca. 5%). The formation of the porphyry and the No.2 deposit were related to the northward intra-oceanic subduction of the Neo-Tethys oceanic slab during the Early Jurassic.

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Provenance of Xigaze fore-arc basin clastic rocks (Cretaceous, south Tibet)

Cited by 179 publications

References 0 publications

Paleocene–Eocene record of ophiolite obduction and initial India‐Asia collision, south central Tibet

Paleocene–Eocene record of ophiolite obduction and initial India‐Asia collision, south central Tibet

Geochemistry and tectonic environment of the Dagzhuka ophiolite in the Yarlung-Zangbo suture zone, Tibet.

Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

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