COLLABORATIVE RESEARCH: Age, Origin and Emplacement History of the Precordillera Ophiolite, Western Argentina: Constraints on the Tectonic Significance of the Laurentia ....

合作研究：阿根廷西部 Precordillera 蛇绿岩的年龄、起源和就位历史：对劳伦西亚构造意义的限制......

• 批准号: 9614722
• 负责人: William McClelland
• 金额: $ 7.87万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-12-15 至 1998-09-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614722&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Age; Origin; Emplacement

9614722 McClelland Recent studies have significantly changed traditional views of the late Proterozoic- early paleozoic paleogeographic reconstructions for Laurentia and Gondwana. Essentially two models are current: eastern North America and western South America were in proximity due to actual collision between Laurentia and Gondwana, or only a rifted portion of North American collided with South America, with a large ocean remaining between the continental masses. This research will test these options by study of a belt of ultramafic and mafic rocks along the west side of the Precordillera which represents the postulated Laurentia- Precordillera ocean. In particular, age dating will address both crystallization and metamorphic ages of these rocks, which differ in each scenario. Results are expected to clarify models for Paleozoic tectonics in southwestern South American by providing information about the ocean basin to the west of the Precordillera terrane and provide the basis for a test between the collisional model and the rifted and drifted terrane model.

9614722 McClelland最近的研究已大大改变了洛尔兹和冈瓦纳晚期原始古生代早期古生代古生代的重建的传统观点。 本质上是两种模型是当前的：北美东部和南美西美地区由于劳伦蒂亚和冈瓦纳之间的实际碰撞而处于靠近状态，或者只有北美的一部分与南美相撞，在大陆群众之间剩下一大海洋。 这项研究将通过研究Precordillera西侧的超镁铁质和镁铁质岩石带的研究来测试这些选择，该岩石代表了假定的Laurentia- Precordillera海洋。 特别是，年龄的年龄将解决这些岩石的结晶和变质年龄，在每种情况下都不同。 预计结果有望通过提供有关Precordillera Terrane西部的海洋盆地的信息来阐明南美西南部的古生代构造模型，并为碰撞模型与裂痕和漂移的地层模型之间的测试提供了基础。