Mid-Crustal Anatexis and Hybridization Associated With Mafic Plutonism in the Bindal Batholith, Norwegian Caledonides

挪威喀里多尼德斯宾达尔基岩中与镁铁质深成体相关的中地壳深熔和混合作用

• 批准号: 9814280
• 负责人: Calvin Barnes
• 金额: $ 18万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814280&HistoricalAwards=false
• 关键词: Mid; Crustal; Anatexis; Hybridization; Associated

9814280BarnesMountain building events are commonly accompanied by emplacement of granitic magmas, the origins of which are currently in debate. In many cases, granitic magmas are hybrids which form when hot magmas derived from the mantle combine with crustal rocks. In other cases, granitic magmas show isotopic and elemental evidence of a purely crustal origin. A crustal origin typically requires transfer of heat sufficient to cause melting. Many investigators call on heat extracted from hot, mantle-derived magmas as the primary source of such crustal melting. In the Velfjord area of north-central Norway, a group of mantle-derived plutons are nearly surrounded by a rind of granitic rocks that were apparently derived by local melting; heat was provided by intrusion of the mantle-derived plutons. Because of the small scale, this setting provides an excellent opportunity to investigate the relationship between crustal melting and heat provided by hotter magmas. Research will focus on determination of the conditions of melting, the thermal requirements for melting, mobility of the granitic melts, and chemical interaction between the crustal melts and their magmatic "heat source". The results will provide a direct analogue to melting that occurs on a crustal scale.

9814280巴恩斯造山事件通常伴随着花岗质岩浆的侵位，其起源目前仍有争议。在许多情况下，花岗质岩浆是地幔热岩浆与地壳岩石联合收割机混合形成的。在其他情况下，花岗质岩浆显示出纯粹地壳起源的同位素和元素证据。地壳起源通常需要足够的热量转移，以引起熔融。许多研究人员认为，从地幔岩浆中提取的热量是地壳熔融的主要来源。在挪威中北部的Velfjord地区，一组幔源深成岩几乎被一层花岗岩包围，这些花岗岩显然是由当地熔融产生的;热量由幔源深成岩的侵入提供。 由于尺度小，这一背景为研究地壳熔融与较热岩浆提供的热量之间的关系提供了极好的机会。研究的重点将是确定熔化的条件、熔化所需的热量、花岗岩熔体的流动性以及地壳熔体与其岩浆“热源”之间的化学相互作用。 结果将提供一个直接的模拟融化发生在地壳规模。