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首页> 外文期刊>Contributions to Mineralogy and Petrology >Evolution of granitoids in the Catalina metamorphic core complex, southeastern Arizona: U–Pb, Nd, and Hf isotopic constraints
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Evolution of granitoids in the Catalina metamorphic core complex, southeastern Arizona: U–Pb, Nd, and Hf isotopic constraints

机译：亚利桑那州东南部卡塔利娜变质岩心复合体中花岗岩的演化：U–Pb，Nd和Hf同位素约束

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The Santa Catalina Mountains, SE Arizona, was one of the first metamorphic core complexes to be described. Despite its status as a type example, relatively little is known about precise ages and origins of the intrusive rocks that make up most of the crystalline core. U–Pb and Hf isotopic data by laser ablation–inductively coupled plasma–mass spectrometry from zircons and Nd isotopic results from whole rocks were obtained for 12 granitoids ranging from 1,440 to 26 Ma. Results confirm that the 1.44-Ga Oracle Granite extends through the Catalina Range as variably mylonitic granite and banded gneiss. Laramide intrusions (67–73 Ma) display initial εNd values −5 to −8 and εHf from −7.5 to −9. Magmatic ages for the prominent white granite sills of the Wilderness suite are 46–57 Ma, in agreement with Terrien (2012), and these granites have initial εNd values −8 to −10 and εHf from −7 to −14. Lastly, the undeformed Catalina Granite has an age of 26 Ma, with an initial εNd and εHf of −6 and −8, respectively. Our Nd results agree with limited results from Farmer and DePaolo (89:10141–10160, 1984). Although the Catalina Granite seems to have a significant juvenile component based on Nd and Hf, most of the Laramide and Wilderness intrusions contain Nd and Hf compositions lying close to the evolution of 1.44-Ga Oracle Granites, a fact that is confirmed by the U–Pb data, which show both 1.7- and 1.4-Ga zircon cores in these samples, with 1.4 Ga as the dominant core age. In order to become the dominant source of most of the 72–45-Ma magmas, the Oracle pluton must not only extend across the whole Catalina region, but also have abundant deep-seated equivalents to provide magma sources.
机译：亚利桑那州东南部的圣卡塔利娜山脉是最早描述的变质核心复合体之一。尽管它是典型的例子，但对构成大部分晶体核的侵入岩的确切年龄和成因知之甚少。通过锆石的激光烧蚀-电感耦合等离子体质谱法获得的U-Pb和Hf同位素数据，以及从1,440至26 Ma范围内的12种花岗岩获得了整个岩石的Nd同位素结果。结果证实1.44-Ga甲骨文花岗岩作为卡特琳娜山脉和变质的麻状花岗岩和条状片麻岩分布于整个卡塔利娜山脉。 Laramide入侵（67-73 Ma）显示的初始εNd值为-5到-8，εHf从-7.5到-9。与Terrien（2012）一致，Wilderness套房中突出的白色花岗岩窗台的岩浆年龄为46-57 Ma，这些花岗岩的初始εNd值为-8至-10和εHf从-7至-14。最后，未变形的Catalina花岗岩的年龄为26Ma，初始εNd和εHf分别为-6和-8。我们的Nd结果与Farmer和DePaolo的有限结果相吻合（89：10141-10160，1984）。尽管卡塔利娜花岗岩似乎具有基于Nd和Hf的重要幼年成分，但是大多数Laramide和Wilderness侵入岩中的Nd和Hf成分接近于1.44-Ga Oracle Granite的演化，这一事实已被U–铅数据显示了这些样品中的1.7-Ga和1.4-Ga锆石核，其中1.4Ga为主要核年龄。为了成为大多数72–45 Ma岩浆的主要来源，甲骨文岩体不仅必须延伸到整个卡塔利娜地区，而且还必须有丰富的深层等效物来提供岩浆源。

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