Tectonic Evolution of the Chortis Block: Implications for Caribbean Tectonics

Chortis 地块的构造演化：对加勒比构造的影响

• 批准号: 9219384
• 负责人: Hans Ave Lallemant
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-12-01 至 1996-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219384&HistoricalAwards=false
• 关键词: Tectonic; Evolution; Chortis; Block; Implications

The Chortis block (Honduras, El Salvador and environs) is a microcontinental block at the northwestern end of the Caribbean plate which may have been transported east from southern Mexico during the Cenozoic opening of the Cayman Trough. However little is known about the tectonic history of this block. This project will gather kinematic data on Cenozoic faulting to help determine slip directions and to infer stress regime and estimate displacements to see if significant Cayman Trough offset is absorbed within the block. In an effort to place age constraints on the tectonic history, U-Pb, 40Ar/39Ar and fission track ages on granitoids and volcanic rocks will be carried out. These data will allow testing of the hypothesis that the Chortis block originated from the truncated southern margin of Mexico, and generally improve the understanding of the transport of microcontinental blocks along a large offset transform fault.

Chortis区块（洪都拉斯、萨尔瓦多及周边地区） 是一个微大陆块体， 加勒比板块可能是从 在新生代开曼群岛开放期间， 低谷。 然而我们对地壳构造的历史 这个街区。 该项目将收集运动学数据， 新生代断层作用有助于确定滑动方向， 推断应力状态并估计位移， 显著的开曼海槽偏移量被吸收在 块 为了对年龄进行限制， 构造历史、U-Pb、40 Ar/39 Ar和裂变径迹年龄 花岗岩类和火山岩。 这些 数据将允许测试的假设， 地块起源于 墨西哥，并普遍提高对 小陆块沿着大偏移距的搬运 转换断层