岩石矿物学杂志2012，Vol.31Issue(3)：289-306,18.
太行山阜平杂岩中麻棚-赤瓦屋岩体的时代、侵位深度及构造意义
Geochronology, emplacement depth and tectonic implications of the Mapeng-Chiwawu granitic pluton in Fuping Complex of the Taihang Mountains
摘要
Abstract
It is known that Mesozoic magmatism generated a series of granitic plutons in the northern segment of the Taihang Mountains. Among others, the Mapeng-Chiwawu pluton just crops out in the central part of the Neoarchean-Paleoproterozoic Fuping Complex, showing I-type calc-alkaline affinity, with low SiO2 and high AL2O3 and alkali content. The pluton consists of quartz diorite, granodiorite and granite from edge to core, and these intrusions yielded LA-ICP-MS zircon U-Pb ages of 126.4 ±2.4 Ma, 125.4 ±2.0 Ma and 126.2 ± 2.0 Ma, indicating that the pluton was emplaced in a short time around 126 Ma (Early Cretaceous). The total amount of Al in hornblende is 1.018, 0.880 and 0.871 for quartz diorite, granodiorite and granite, and accordingly the crystallization pressure of hornblende is 0.183, 0.118 and0.114 GPa, with an average of 0.141 GPa, indicating a depth of ca. 5 km. This is significantly smaller than the thickness of Proterozoic to Jurassic sequences around the Fuping Complex, suggesting a dome-shaped structure for the Fuping Complex before the Early Cretaceous. Combined with other data, an average uplift rate of 0.07～0.08 km/Ma can be obtained for the Tai-hang Mountains since the Early Cretaceous.关键词
麻棚-赤瓦屋岩体/锆石U-Pb定年/角闪石全铝压力计/侵位深度/隆升速率/太行山Key words
Mapeng-Chiwawu granitic pluton/ zircon U-Pb age/ Al-in-hornblende barometer/ emplacement depth/ uplift rate/ Taihang Mountains分类
天文与地球科学引用本文复制引用
李林林,韩宝福,苗国均,舒桂明,陈家富,杨进辉,杨岳衡,张艳斌..太行山阜平杂岩中麻棚-赤瓦屋岩体的时代、侵位深度及构造意义[J].岩石矿物学杂志,2012,31(3):289-306,18.基金项目
国家自然科学基金资助项目(90714006) （90714006）
中国地质调查局项目(1212011120135) （1212011120135）
