Showing 741 - 760 results of 1,318 for search 'Jurassic 5', query time: 0.14s Refine Results
  1. 741

    Primary Composition of Kimberlite Melt by Sergey Kostrovitsky, Anna Dymshits, Dmitry Yakovlev, Jing Sun, Tatiana Kalashnikova, Igor Ashchepkov, Olga Belozerova

    Published 2023-11-01
    “…It is suggested that the primary kimberlite melt of asthenospheric origin is similar in composition to the high Fe, high Ti, coherent kimberlite from the Velikan dyke (in wt. %: SiO<sub>2</sub>–21.8, TiO<sub>2</sub>–3.5, Al<sub>2</sub>O<sub>3</sub>–4.0, FeO–10.6, MnO–0.19, MgO–21.0, CaO–17.2, Na<sub>2</sub>O–0.24, K<sub>2</sub>O–0.78, P<sub>2</sub>O<sub>5</sub>–0.99, CO<sub>2</sub>–12.6). …”
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  2. 742

    Zircon U-Pb and Lu-Hf Isotopic Dating of Magmatic Rocks in the Wunugetushan Porphyry Copper-Molybdenum Deposit, Inner Mongolia by ZHANG Xuejun, ZHANG Yaoyao, LIU Kai, HE Xiaolong, WANG Shuxun, JIA Wuhui, ZHAO Zenan

    Published 2022-09-01
    “…RESULTS (1) The zircons in the study area have a high content of REE with strong enrichment of HREE, δEu negative anomaly and δCe positive anomaly, and the REE distribution curves are left-inclined. (2) The anisomitic monzogranites are the ore-hosting rocks with a weighted average value of 200.96±0.88Ma, indicating that the rock mass was formed in early Jurassic. Zircon εHf(t) ranges from 0.1 to 5.8, single-stage Hf model ages (TDM) range from 643Ma to 882Ma, and two-stage Hf model ages (TDMC) range from 874Ma to 1235Ma. (3) The rhyolite porphyritic lavas are the ore-forming parent rocks with a weighted average value of 179.58±0.91Ma, indicating that the rocks formed in the Early Jurassic. …”
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  3. 743
  4. 744

    Mesozoic Thermo-Tectonic Evolution of the Western Altai Orogenic Belt (NW China): Insights from Low-Temperature Thermochronology by Mingxuan Wu, Jiyuan Yin, Zhiyuan He, Wenjiao Xiao, Yannan Wang, Wen Chen, Yamei Wang, Jingbo Sun, Dapeng Li, Yun Meng

    Published 2023-07-01
    “…Based on the associated thermal history modeling results, the Habahe area underwent a moderate cooling during the Late Triassic to Middle Jurassic (~230–170 Ma) with a cooling rate of ~0.8–1.1℃/Ma and a subsequent moderate to slightly rapid cooling stage during the Middle Jurassic to Early Cretaceous (170–130 Ma) with a cooling rate of ~1.5–2.3℃/Ma. …”
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  5. 745
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  7. 747

    Mineralization Age and Hydrothermal Evolution of the Fukeshan Cu (Mo) Deposit in the Northern Great Xing’an Range, Northeast China: Evidence from Fluid Inclusions, H–O–S–Pb Isotope... by Yong-gang Sun, Bi-le Li, Qing-feng Ding, Yuan Qu, Cheng-ku Wang, Lin-lin Wang, Qing-lin Xu

    Published 2020-06-01
    “…Chalcopyrite Re–Os dating yielded an isochron age of 144.7 ± 5.4 Ma, which is similar to the zircon U–Pb age of the quartz diorite porphyry, indicating that Late Jurassic quartz diorite porphyry and Cu mineralization occurred contemporaneously.…”
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  8. 748
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  14. 754

    History of karstification and groundwater flow field within Triassic water-bearing strata in Julongshan syncline by Yu Fan, Wei Chang, Shiyi Wei, Junwei Wan, Kun Huang

    Published 2022-09-01
    “…This period mainly manifested as burial karst under the water. From the Middle Jurassic to the Early Cretaceous, the EW-NW folds and faults or fissures were formed by Yanshanian movement, controlling the plane distribution pattern of carbonate rocks. …”
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  15. 755
  16. 756

    A carbon-isotope perturbation at the Pliensbachian-Toarcian boundary: evidence from the Lias Group, NE England by Littler, K, Hesselbo, S, Jenkyns, H

    Published 2010
    “…Two sharp δ13C org negative excursions, each with a magnitude of ∼ -2.5‰ and reaching minimum values of -28.5‰ , are recorded in the bulk organic-matter record in sediments of latest Pliensbachian to earliest Toarcian age. …”
    Journal article
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  18. 758

    Potential for Volcanogenic Massive Sulfide Mineralization at the A6 Anomaly, North-West British Columbia, Canada: Stratigraphy, Lithogeochemistry, and Alteration Mineralogy and Che... by Stefanie M. Brueckner, Gregory Johnson, Stephanie Wafforn, Harold Gibson, Ross Sherlock, Christina Anstey, Ken McNaughton

    Published 2021-08-01
    “…The Middle Jurassic A6 Anomaly is located 30 km southeast of Eskay Creek, north-central British Columbia and consists of thick, altered felsic igneous rocks overlain by a mafic volcano-sedimentary package. …”
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  19. 759
  20. 760

    INTEGRATED STRATIGRAPHY OF THE LOWER AND MIDDLE FERNIE FORMATION IN ALBERTA AND BRITISH COLUMBIA, WESTERN CANADA by RUSSELL HALL, VICKI MCNICOLL, DARREN GRÖCKE, JAMES CRAIG, KEVIN JOHNSTON

    Published 2004-03-01
    “…Here we report six new ages from the lowermost Red Deer Member (188.3 +1.5/-1 Ma); Highwood Member (ca. 173 Ma and 166.6 ± 0.2 Ma); and Grey Beds (167.0 ± 0.2 Ma, 165.6 ± 0.3 Ma, and 165.4 ± 0.3 Ma). …”
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