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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China
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Sichuan China (1)
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Xizang China (2)
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Yunnan China (1)
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Tibetan Plateau (2)
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Kerguelen Plateau (1)
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Pacific Ocean
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igneous rocks
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igneous rocks
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granodiorites (1)
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metamorphic rocks
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metamorphic rocks
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minerals
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Primary terms
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Asia
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Far East
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China
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Sichuan China (1)
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Xizang China (2)
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Yunnan China (1)
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Tibetan Plateau (2)
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igneous rocks
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plutonic rocks
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granites
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metal ores
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lithium ores (1)
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metals
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alkali metals
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rubidium (2)
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alkaline earth metals
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barium (1)
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strontium
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Sr-87/Sr-86 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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metamorphic rocks
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metasedimentary rocks (1)
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Ocean Drilling Program
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Leg 119
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ODP Site 744 (1)
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Leg 199
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ODP Site 1218 (1)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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East Pacific
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tectonics (2)
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sedimentary rocks
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sedimentary rocks
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Markam China
Whole-Rock and Apatite Geochemistry of Late Triassic Plutonic Rocks in the Eastern Songpan-Ganzi Orogenic Belt: Petrogenesis and Implications for Tectonic Evolution
The composite metamorphic sequence in the Jiajika gneiss dome, Songpan-Ganze orogenic belt, eastern Tibet: P - T - D - t evolution and implications for lithium mineralization
Late Cretaceous Tectonic Change of the Eastern Margin of the Tibetan Plateau – Results from Multisystem Thermochronology
Denudational response to surface uplift in east Tibet: Evidence from apatite fission-track thermochronology
The 2022 M s 5.8 and 6.0 Maerkang Earthquakes: Two Strike‐Slip Events Occurred on V‐Shaped Faults
Origins and evolution of two types of Late Triassic granitic magmas in the Caolong-Xiangkariwa area of central-eastern Songpan-Ganze terrane, northern Tibet: Implications for pegmatite lithium mineralization
Astronomically forced climate variability across the Eocene–Oligocene transition from a low latitude terrestrial record (Lühe Basin, South China)
Abstract We present a synthesis of the tectonic and thermochronological evolution of the Eastern Tibet since the Triassic. The long-term cooling histories obtained on magmatic and metamorphic rocks of the South Songpan-Garzê, Kunlun and Yidun blocks are similar showing a very slow and regular cooling during Late Jurassic and Cretaceous, confirming the suspected lack of major tectonic events between c . 150 and 30 Ma. The exhumation linked to the Tertiary growth of the Tibetan Plateau initiated around 30 Ma and concentrates at the vicinity of the major tectonic structures. Exhumation rates increased again from about 7 Ma in the Longmen Shan. To interpret this very slow cooling rate between Late Jurassic and Early Cenozoic from granites of this area, we use a simple 1D thermal model that takes into account the thermal properties of both sediments and crust. The results suggest that: (1) high temperature (500 °C) can be kept over a long period of time; (2) during Cretaceous, cooling is mostly controlled by the thermal properties of sediments of continental origin; and (3) the initial Late Triassic rapid cooling rate was caused by the large thermal contrast between the granite body and the sedimentary rocks rather than by a high exhumation rate.
Mesozoic red bed sequences from SE Asia and the significance of the Khorat Group of NE Thailand
Abstract New geological data are presented and previously published information is reviewed to demonstrate that much of the Khorat Group (Phu Kradung to Khok Kruat Formations) of NE Thailand is Early Cretaceous in age. It is suggested that the Mesozoic red bed sequences of neighbouring Indochina are likely to be of similar age rather than spanning the entire Late Triassic to Early Cretaceous as previously assumed. Moreover, the Lower Nam Phong Formation dated as Late Triassic and previously included as the basal formation of the Khorat Group is now removed from this group, thus creating a hiatus within the Jurassic. There is therefore no clear relationship between the Indosinian Orogeny and the Triassic collision of the Sibumasu (also referred to as Shan-Thai) and Indochina Blocks and the subsequent deposition of the Khorat Group in a Late Triassic–Early Cretaceous thermal sag basin. It is now proposed that much of the sequence was deposited during the Late Jurassic–Early Cretaceous. Jurassic sediments may be absent across much of the Khorat Plateau whereas marine Jurassic sediments to the west and east show no sediments younger than Bajocian. Because sea levels were generally rising in the Middle and Late Jurassic it is likely that the Khorat region was uplifted at this time. It is suggested that the Khorat Group was originally deposited in a foreland basin setting rather than a thermal sag basin following Late Triassic rifting. Moreover, the original site of deposition was to the north in southern China, with the present-day location being the result of movement along the Red River Fault coupled with a clockwise rotation of the Indochina Block (on which the Khorat Group sits) with respect to the South China Block.
Global Carboniferous brachiopod biostratigraphy
Abstract We present an updated look at Carboniferous brachiopod biozonation from most of the world framed into a revised Carboniferous palaeogeography, based on a selection of the literature published on Carboniferous brachiopods since the nineteenth century. The biostratigraphic significance of the most important brachiopod taxa is synthesized in seven geographical correlations. The Mississippian is characterized by rich brachiopod faunas, with widespread taxa with a good potential for global correlation, such as Rugosochonetes , Delepinea , Buxtonia , Antiquatonia , Spinocarinifera , Marginatia , Fluctuaria , Ovatia , Rhipidomella , Lamellosathyris , Unispirifer , Tylothyris and Syringothyris . From the mid-Visean to the late Serpukhovian, taxa of gigantoproductidines are biostratigraphically significant, and occur everywhere except South America and Australia, which remain as distinct faunal successions for most of the period. A major turnover occurs at the beginning of the Pennsylvanian, characterized by a higher degree of provincialism. Pennsylvanian brachiopod faunas are diverse in China, Russia and North America, but otherwise they are less developed and are characterized mostly by endemic taxa, hampering long-distance correlation. An exception is the rapid diversification of taxa of the Choristitinae, which were widespread from the Bashkirian to the Moscovian, allowing long-distance correlation.