2006-2010年熊耳山地区花山花岗岩锆石U-Pb、Lu-Hf同位素及岩石地球化学研究数据集

对华北南缘熊耳山地区的花山花岗岩基进行了主量元素、微量元素、锆石U-Pb定年及Hf同位素测定。花山复式花岗岩主要由晚侏罗世五丈山岩体以及早白垩世蒿坪和金山庙岩体组成。通过精确的锆石LA-ICP-MS U-Pb方法定年，获知蒿坪与金山庙岩体成岩年龄变化于127.6 Ma -129.3 Ma之间，表明二者应为同一构造-岩浆事件的产物，在成岩时代上与金矿大规模成矿有紧密联系。蒿坪和金山庙岩体均具高硅准铝、富碱高钾以及富铁贫镁的特征，且富集Rb、Ba、Sr、La、Ce等大离子亲石元素和轻稀土元素，亏损Nb、Ta、Ti、Y、Yb等高场强元素和重稀土元素，其岩石成因类型应为I型花岗岩，其中，金山庙岩体经历了较高程度的分离结晶作用（D.I.=96.6~97.3），可归属为高分异I型花岗岩。锆石Lu-Hf同位素示踪显示，蒿坪岩体？Hf(t) = -10.2 ~ -13.3，TDM2 = 1.8 Ga~2.0 Ga，金山庙岩体？Hf(t) = -13.3~-17.5，TDM2 = 2.0 Ga-2.2 Ga，表明二者的源区为遭受了幔源或新生地壳改造的太华群古老基底物质，金山庙岩体？Hf(t)值较蒿坪岩体低很可能是因为在上升侵位过程中卷入了更多的地壳组分。蒿坪与金山庙岩体形成于扬子陆块与华北陆块碰撞造山后的陆内伸展引张环境。

The Huashan granitic batholith in the Xiong’er Mountain area, southern margin of the North China Craton, was subjected to analyses of major elements, trace elements, zircon U-Pb dating and Hf isotope composition. The Huashan composite granite batholith is primarily composed of the Late Jurassic Wuzhangshan pluton, as well as the Early Cretaceous Haoping and Jinshanmiao plutons. Precise zircon LA-ICP-MS U-Pb dating shows that the crystallization ages of the Haoping and Jinshanmiao plutons range from 127.6 Ma to 129.3 Ma, indicating that they were formed during the same tectono-magmatic event, and their formation timing is closely associated with large-scale gold mineralization. Both the Haoping and Jinshanmiao plutons exhibit the characteristics of high silicon, metaluminous, alkali-rich and K-rich, Fe-enriched and Mg-depleted features; they are enriched in large ion lithophile elements (LILEs including Rb, Ba, Sr, La, Ce) and light rare earth elements (LREEs), and depleted in high field strength elements (HFSEs such as Nb, Ta, Ti, Y, Yb) and heavy rare earth elements (HREEs). Their petrogenetic type is classified as I-type granite. Notably, the Jinshanmiao pluton has undergone a high degree of fractional crystallization (D.I. = 96.6–97.3), and can be assigned to highly fractionated I-type granite. Zircon Lu-Hf isotope tracing reveals that the εHf(t) values of the Haoping pluton range from -10.2 to -13.3, with two-stage model ages (TDM2) of 1.8 Ga to 2.0 Ga; while those of the Jinshanmiao pluton range from -13.3 to -17.5, with TDM2 values of 2.0 Ga to 2.2 Ga. This demonstrates that their source regions are ancient basement materials of the Taihua Group modified by mantle-derived or newly formed crust. The lower εHf(t) values of the Jinshanmiao pluton relative to the Haoping pluton are most likely attributed to the incorporation of more crustal components during magma ascent and emplacement. The Haoping and Jinshanmiao plutons were formed in the post-collisional intracontinental extensional setting following the collisional orogeny between the Yangtze Craton and the North China Craton.

搜集汇总

背景与挑战

背景概述

该数据集包含2006-2010年华北南缘熊耳山地区花山花岗岩基的主量元素、微量元素、锆石U-Pb定年及Hf同位素测定数据，揭示了蒿坪与金山庙岩体的成岩年龄、岩石成因类型及形成环境。数据通过高精度的实验方法获得，质量可靠，为研究华北南缘地质演化及成矿作用提供了重要依据。