globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116425
论文题名:
Hydrothermal alteration associated with the Chicxulub impact crater upper peak-ring breccias
作者: Simpson S.L.; Osinski G.R.; Longstaffe F.J.; Schmieder M.; Kring D.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547
语种: 英语
中文关键词: astrobiology ; Chicxulub impact ; impact cratering ; impact generated hydrothermal systems
英文关键词: Binary alloys ; Calcite ; Clay minerals ; Core drilling ; Feldspar ; Glass ; Infill drilling ; Iron alloys ; Iron oxides ; Lithology ; Magnesium alloys ; Offshore oil well production ; Saline water ; Sedimentary rocks ; Silicates ; Structural geology ; Sulfur compounds ; Titanium alloys ; Titanium oxides ; Zeolites ; Alkali feldspar ; Alteration phasis ; Chicxulub impact ; Continental scientific drillings ; Crystalline basement ; Granitoid rocks ; Hydrothermal alterations ; Preliminary analysis ; Clay alteration ; breccia ; crater ; granitoid ; hydrothermal alteration ; lithology ; volcanic glass ; water-rock interaction ; zeolite ; Bay of Campeche ; Chicxulub Crater ; Mexico [North America] ; Yucatan
英文摘要: The 66 Ma, ∼180 km Chicxulub impact structure in the northern Yucatán peninsula and southern Gulf of Mexico is the best-preserved large impact crater on Earth with a well-developed peak ring. The most recent drilling campaign took place offshore during the joint International Ocean Discovery Program – International Continental Scientific Drilling Program (IODP–ICDP) Expedition 364 at site M0077A (21.45°N, 89.95°W) and recovered ∼830 m of continuous core. Initial examination revealed that the peak-ring comprises four main lithological units (from the base upwards): crystalline basement granitoid rocks (Unit 4); a thin layer of impact melt rocks (Units 3A and B); melt-bearing breccias (Units 2A–C); and post-impact sedimentary rocks (Unit 1). Preliminary analysis of the drill core indicated that hydrothermal alteration has affected all lithologies and is especially pervasive in the melt-bearing breccias of Unit 2 (721.6 to 617.33 meters below sea floor, mbsf). Here we present the first detailed investigation of hydrothermal alteration within the melt-bearing breccias. Alteration phases are predominantly Fe-Mg clay minerals, zeolites, alkali feldspars, calcite and minor sulfides, sulfates, opal and Fe-Ti oxides. Alteration is especially intense proximal to lithologic contacts, particularly at the base of subunit 2B where there is an abrupt increase in host rock porosity ∼30 m above the impact melt rocks. The pervasiveness of clay minerals and zeolites is attributed to the high amounts of devitrified silicate glass throughout Unit 2. The phases preserved here are consistent with the findings of previous hydrothermal studies in other areas of the Chicxulub structure, and suggest an evolving water-rock system that was alkaline-saline, comparable to seawater-volcanic glass alteration. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165268
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作者单位: Department of Earth Sciences, Institute for Earth and Space Exploration, The University of Western OntarioON N6A 3K7, Canada; Lunar and Planetary Institute, Universities Space Research Association, Houston, TX 77058, United States

Recommended Citation:
Simpson S.L.,Osinski G.R.,Longstaffe F.J.,et al. Hydrothermal alteration associated with the Chicxulub impact crater upper peak-ring breccias[J]. Earth and Planetary Science Letters,2020-01-01,547
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