Collaborative Research: Sourcing A-type Granites in Ancient Rifts

9316567 Wright南俄克拉荷马州Aulacogen的威奇托花岗岩是侵入大陆裂谷的A型花岗岩的经典例证，代表了对花岗岩来源发展新见解的机会。 有限的，新的化学和同位素数据的威奇托花岗岩的建议推导玄武岩的结晶分馏与地壳的参与与大多数以前提出的模型。 从这一重要的A型花岗岩群中选择花岗岩进行化学和同位素联合研究，可以成功地确定地壳裂谷中A型花岗岩岩石成因的来源和过程。 威奇托花岗岩已被细分为三个化学组。 纹理，矿物学和化学研究选定的花岗岩片，代表三个化学组，将澄清这些套房。 将地球化学数据与同位素数据相结合，将使我们能够通过分馏效应来描述来源。 锆石和钛铁矿的地质年代学研究应确定结晶年龄和潜在的来源年龄。 如果要了解A型花岗岩的来源，则需要在约束良好的构造环境中进行这种研究。

9316567 Wright The Wichita granites of the Southern Oklahoma Aulacogen, a classic illustration of A-type granites intruded in a continental rift, represent an opportunity to develop new insights into granite sourcing. Limited, new chemical and isotopic data on the Wichita granites suggest derivation by crystal fractionation of basalt with minor crustal involvement contrary to most previously proposed models. A combined chemical and isotopic study of selected granites from this important group of A-type granites can successfully identify sources and processes involved in A- type granite petrogenesis in crustal rifts. The Wichita Granites have already been subdivided into three chemical groups. Textural, mineralogic, and chemical studies of selected granite sheets, representing the three chemical groups, will clarify these suites. Combining geochemical data with isotopic data will allow us to see through fractionation effects in order to characterize sources. Geochronological studies of zircon and titanite should define crystallization ages and potentially source ages. Such a study is required in a well constrained tectonic setting if the source of A-type granites is to be understood.