Volcanism and Tectonics of Jalisco Block

哈利斯科地块的火山活动和构造

• 批准号: 9315844
• 负责人: Ian S. Carmichael
• 金额: $ 19.08万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-15 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9315844&HistoricalAwards=false
• 关键词: Volcanism; Tectonics; Jalisco; Block

9315844 Carmichael The Jalisco Block has geological properties that are in stark contrast to the neighboring regions of western Mexico, such as the geological succession, volcanism, grade of metamorphism, faulting and relief; it is an exciting but largely unknown area. We propose to: (1) document geologic and tectonic aspects of the Jalisco Block that distinguish it from its surroundings and define it as a tectonically- independent block. We will also determine whether extensive eruptions of plateau basalt characterize extension along the Block's northern margin and whether the sources of these voluminous basalts are in the aesthenosphere or the lithosphere; (2) determine the uplift/exhumation history of the Jalisco Block using the stratigraphy of the volcanic cover and mineral assemblages of exposed plutons and their metamorphic envelopes; (3) determine the direction of relative motion between the Jalisco Block and the North American plate (for the last 10Ma), by examining datable faults that frequent the bounding rift zones of the Block.

9315844 Carmichael 哈利斯科地块的地质特征与墨西哥西部邻近地区形成鲜明对比，如地质序列、火山活动、变质程度、断层和地势；这是一个令人兴奋但很大程度上不为人知的领域。 我们建议：（1）记录哈利斯科地块的地质和构造方面，将其与周围环境区分开来，并将其定义为构造独立的地块。 我们还将确定高原玄武岩的广泛喷发是否是沿该地块北缘延伸的特征，以及这些大量玄武岩的来源是在软流圈还是岩石圈； (2) 利用火山盖层和裸露岩体矿物组合及其变质包层的地层学确定哈利斯科地块的隆起/折返历史； (3) 通过检查经常出现在哈利斯科地块边界裂谷带的可记录断层，确定哈利斯科地块和北美板块之间的相对运动方向（过去 10 Ma）。