Stratigraphy of the Upper Cretaceous and Lower Tertiary strata in the Tethyan Himalayas of Tibet (Tingri area, China)

Willems, Helmut; Zhou, Zhao-Nian; Zhang, B.; Gräfe, Kai-Uwe

doi:10.1007/s005310050108

Cited by 42 publications

(86 citation statements)

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“…Numerous evidence implies that [24][25][26][27][28][29][30][31][32] initiation of the India-Asia collision occurred no later than 65 Ma and the completion of collision is between 45 Ma and 40 Ma. Both magma underplating and magma mixing took place approximately at 50 Ma during collision.…”

Section: Discussionmentioning

confidence: 99%

Geochronologic constraints on magmatic intrusions and mineralization of the Zhunuo porphyry copper deposit in Gangdese, Tibet

Zheng

Gang-yang

et al. 2007

Chin. Sci. Bull.

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In situ zircon U-Pb ages for the recently discovered Zhunuo porphyry copper deposit in the western part of the Gangdese metallogenic belt in Tibet were determined by sensitive high-resolution ion microprobe (SHRIMP). The ages can be divided into two separate groups, reflecting more than four major tectono-magmatic events in the area. The 62.5±2.5 Ma age of inherited zircons may be related to the volcanic eruption of the Linzizong Group formed shortly after the India-Asia continental collision. The 50.1±3.6 Ma age most likely corresponds to the time of underplating of mantle-derived mafic magma in Gangdese. The 15.6±0.6 Ma age obtained from magmatic zircons is interpreted as the age of crystallization of the Zhunuo ore-forming porphyry. Finally, a molybdenite Re-Os isochron age of 13.72±0.62 Ma is consistent with another zircon U-Pb age of 13.3 ±0.2 Ma, representing the time of copper mineralization. These ages, in combination with available literature data, indicate that magmatic crystallization and copper mineralization in the Gangdese metallogenic belt became gradually younger westward, and further suggest that the Zhunuo porphyry copper deposit was formed in the same tectonic stage as other porphyry copper deposits in the eastern and central Gangdese belt. This conclusion provides critical information for future exploration of porphyry copper deposits in western Gangdese.

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Section: Discussionmentioning

confidence: 99%

Geochronologic constraints on magmatic intrusions and mineralization of the Zhunuo porphyry copper deposit in Gangdese, Tibet

Zheng

Gang-yang

et al. 2007

Chin. Sci. Bull.

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“…Northward subduction of the Neo-Tethyan oceanic crusts during the Cretaceous culminated in continental collision between the India and Lhasa blocks during the early Paleogene. The timing of the collision varies according to different authors, from the early Maastrichtian (Liu and Einsele, 1994;Willems et al, 1996) to the Eocene (Rowley, 1998;Searle et al, 1987). Wan et al (2002) placed the closure in the earliest Danian.…”

Section: Geological Overviewmentioning

confidence: 99%

“…The northern zone is dominated by slightly metamorphosed deposits of outer shelf, continental slope and rise environments, whereas the southern zone is characterized by nonmetamorphosed shallow-water shelf calcareous and terrigeneous deposits, ranging from Paleozoic to Eocene in age (Wen, 1987;Willems et al, 1996).…”

Section: Geological Overviewmentioning

confidence: 99%

Biostratigraphy of a Paleocene–Eocene Foreland Basin boundary in southern Tibet

Wan

Wang

Jansa

2010

Geoscience Frontiers

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This study of the PaleoceneeEocene boundary within a foreland basin of southern Tibet, which was dominated by a carbonate ramp depositional environment, documents more complex environmental conditions than can be derived from studies of the deep oceanic environment. Extinction rates for larger foraminiferal species in the Zongpu-1 Section apply to up to 46% of the larger foraminiferal taxa. The extinction rate in southern Tibet is similar to rates elsewhere in the world, but it shows that the Paleocene fauna disappeared stepwise through the Late Paleocene, with Eocene taxa appearing abruptly above the boundary. A foraminifera turnover was identified between Members 3 and 4 of the Zongpu Formationdfrom the MiscellaneaeDaviesina assemblage to an OrbitoliteseAlveolina assemblage. The Paleocene and Eocene boundary is between the SBZ 4 and SBZ 5, where it is marked by the extinction of Miscellanea miscella and the first appearance of Alveolina ellipsodalis and a large number of Orbitolites. Chemostratigraphically, the d 13 C values from both the Zongpu-1 and Zongpu-2 Sections show three negative excursions in the transitional strata, one in Late Paleocene, one at the boundary, and one in the early Eocene. The second negative excursion of d 13 C, which is located at the PeE boundary, coincides with larger foraminifera overturn. These faunal changes and the observed d 13 C negative excursions provide new evidence on environmental changes across the PaleoceneeEocene boundary in Tibet. ª

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“…65 Ma [23] . Sedimentologically, the abrupt change of sedimentary facies which may represented the collision was during 70-40 Ma [110][111][112][113][114][115] , but the cessation of marine deposition cannot mark the continental collision, because the marine deposition may continue in the residual sea after the collision [12] . Furthermore, the appearance of zircons possessing characters of Gangdese batholith in Sangdanlin Formation north of Yarlung Tsangpo suture constrained the collisional time of 56 Ma [12] .…”

Section: Age Of the Initial India-asia Collisionmentioning

confidence: 99%

Geochronology and petrogenesis of granitic rocks in Gangdese batholith, southern Tibet

Liu

et al. 2009

Sci. China Ser. D-Earth Sci.

144

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Based on petrological and geochemical characteristics such as rock assemblage, petrogeochemistry, Sr-Nd isotope, zircon U-Pb age, and Hf isotope, we studied geochronological framework, magma types, source characters, and petrogenesis of different stages of magmatism of the granitic rocks from the Gangdese batholith in southern Tibet. The magmatic activities of the Gangdese batholith can be divided into three stages. The Mesozoic magmatism, induced by northern subduction of Neotethyan slab, was continuously developed, with two peak periods of Late Jurassic and Early Cretaceous. The Paleocene-Eocene magmatism was the most intensive, and resulted from a complex progress of Neotethyan oceanic slab, including subduction, rollback, and subsequent breakoff. And the Oligocene-Miocene magmatism was attributed to the convective removal of thickened lithosphere in an east-west extension setting after India-Asia collision. Isotopically, zircons from these granitic rocks are characterized by positive ε Hf (t) values, suggesting that the magmatic source of the Gangdese batholith might be an arc terrane, which was accreted to the southern margin of Asia during Late Paleozoic. Therefore, the chronological framework and Hf isotopic characteristics of the Gangdese batholith are distinct from the granitic rocks in adjacent areas, which can be served as a powerful tracer in studying source-to-sink relation of sediments during the uplift and erosion of Tibetan Plateau.

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Stratigraphy of the Upper Cretaceous and Lower Tertiary strata in the Tethyan Himalayas of Tibet (Tingri area, China)

Cited by 42 publications

References 0 publications

Geochronologic constraints on magmatic intrusions and mineralization of the Zhunuo porphyry copper deposit in Gangdese, Tibet

Geochronologic constraints on magmatic intrusions and mineralization of the Zhunuo porphyry copper deposit in Gangdese, Tibet

Biostratigraphy of a Paleocene–Eocene Foreland Basin boundary in southern Tibet

Geochronology and petrogenesis of granitic rocks in Gangdese batholith, southern Tibet

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