IGGCAS OpenIR  > 新生代地质与环境院重点实验室
LA-ICP-MS U-Pb geochronology and clumped isotope constraints on the formation and evolution of an ancient dolomite reservoir: The Middle Permian of northwest Sichuan Basin (SW China)
Pan, Liyin1,2,6; Shen, Anjiang1,2; Zhao, Jian-xin3,4; Hu, Anping1,2; Hao, Yi1,2; Liang, Feng1,2; Feng, Yuexing3; Wang, Xiaofang1,2; Jiang, Lei5
2020-09-01
Source PublicationSEDIMENTARY GEOLOGY
ISSN0037-0738
Volume407Pages:17
AbstractRecent advances in laser-ablation inductively coupled-plasma mass spectrometry (LA-ICP-MS) in-situ U-Pb radiometric dating and clumped isotope thermometry (Delta(47)) of carbonate minerals provide potential for refining the fluid flow and diagenetic history of carbonate successions. In this study, the Middle Permian dolomites proximal to the Longmenshan fold and thrust belt in northwest Sichuan Basin, southwest China, were investigated using combined U-Pb geochronology, clumped isotope thermometry, and routine isotopic (delta C-13, delta O-18 and Sr-87/Sr-88) and elemental geochemistry, in an attempt to reveal the possible relevance of carbonate diagenesis and porosity evolution to the basin-scale tectonic/fluid flow events in the framework of absolute time. Overall, formation and evolution of these dolomites temporally correlated well with major tectonic episodes of the Longmenshan fold and thrust belt. Contrary to the previously-assumed volcanic-related model, U-Pb dating and Delta(47) analyses suggest a mid- to late-Triassic replacive dolomitization event (U-Pb ages of 240 +/- 12 Ma to 233.8 +/- 6.4 Ma) by a hot (Delta(47) temperatures 88- 104 degrees C) basinal brine, which was likely driven by thrust-related compression of the Longmenshan fold and thrust belt during the Triassic. Replacive dolomitization was immediately followed by cementation of euhedral dolomites (U-Pb age of 228 +/- 10 Ma) and blocky calcites (U-Pb ages of 224.8 +/- 1.8 Ma to 213.4 +/- 3.3 Ma) precipitated from the basinal brine in the same tectonic regime. Afterwards, there was long-term cessation of diagenesis that was coincident with, and thus may well be attributed to, tectono-thermal quiescence during most of the Mesozoic Era and Paleogene. Finally, saddle dolomite cements yield Miocene ages (U-Pb ages of 16.40 +/- 0.74 Ma to 12.3 +/- 12 Ma) and precipitated in pre-existing vugs, representing a hydrothermal fluid flow event (Delta(17) temperatures up to 170 degrees C) during the reactivation of thrusting. In addition, similarities in U-Pb ages and geochemical signatures between host rocks (replacive dolomites) and the vug-lining dolomite cements suggest that most porosity in these dolomite reservoirs was inherited from the precursor limestones, which probably experienced meteoric leaching during late Permian uplift. This study highlights that there are geodynamic controls on fluid flow and consequent diagenetic evolution of carbonates in tectonically active sedimentary basins. It illustrates that burial alone in this setting is not a sufficient driver for diagenetic alteration and porosity reduction. The combination of U-Pb radiometric dating, clumped isotope thermometry and routine geochemical analyses is a useful approach in refining the diagenetic and porosity evolution history of ancient carbonate successions. (C) 2020 Elsevier B.V. All rights reserved.
KeywordCarbonate U-Pb dating Carbonate clumped isotope thermometry Middle Permian dolomite Emeishan Large Igneous Province Longmenshan fold and thrust belt Sichuan Basin
DOI10.1016/j.sedgeo.2020.105728
Funding OrganizationChina National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects
WOS KeywordFLUID INCLUSION THERMOMETRY ; LARGE IGNEOUS PROVINCE ; HYDROTHERMAL DOLOMITE ; CARBONATE POROSITY ; LOWER ORDOVICIAN ; EASTERN MARGIN ; DIAGENESIS ; CALCITE ; AGE ; DOLOMITIZATION
Language英语
Funding ProjectChina National Science and Technology Major Project[2016ZX05004-002] ; PetroChina Science and Technology Specific Projects[2018A-0103] ; PetroChina Science and Technology Specific Projects[2018D-5006-35]
Funding OrganizationChina National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Science and Technology Specific Projects ; PetroChina Science and Technology Specific Projects
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000568166300002
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/98223
Collection新生代地质与环境院重点实验室
Corresponding AuthorPan, Liyin
Affiliation1.China Natl Petr Corp, Key Lab Carbonate Reservoirs, Hangzhou 310023, Peoples R China
2.PetroChina Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China
3.Univ Queensland, Sch Earth & Environm Sci, Brisbane, Qld 4072, Australia
4.Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Inst Geol, Beijing 100037, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
6.Univ Kansas, Dept Geol, Lawrence, KS 66045 USA
Recommended Citation
GB/T 7714
Pan, Liyin,Shen, Anjiang,Zhao, Jian-xin,et al. LA-ICP-MS U-Pb geochronology and clumped isotope constraints on the formation and evolution of an ancient dolomite reservoir: The Middle Permian of northwest Sichuan Basin (SW China)[J]. SEDIMENTARY GEOLOGY,2020,407:17.
APA Pan, Liyin.,Shen, Anjiang.,Zhao, Jian-xin.,Hu, Anping.,Hao, Yi.,...&Jiang, Lei.(2020).LA-ICP-MS U-Pb geochronology and clumped isotope constraints on the formation and evolution of an ancient dolomite reservoir: The Middle Permian of northwest Sichuan Basin (SW China).SEDIMENTARY GEOLOGY,407,17.
MLA Pan, Liyin,et al."LA-ICP-MS U-Pb geochronology and clumped isotope constraints on the formation and evolution of an ancient dolomite reservoir: The Middle Permian of northwest Sichuan Basin (SW China)".SEDIMENTARY GEOLOGY 407(2020):17.
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