U-Pb geochronology of the eastern Abitibi Subprovince. Part 2: Noranda - Kirkland Lake area
U-Pb geochronology of the eastern Abitibi Subprovince. Part 2: Noranda - Kirkland Lake area
复制标题
DOI：
10.1139/e93-003
复制
发表时间：
1993
影响因子：
1.4
通讯作者：
J. Mortensen
中科院分区：
文献类型：
--
作者：
J. Mortensen
诺兰达和柯克兰湖地区15个火山和深成单元的锆石U-Pb年龄有助于制约阿比提比带中南部的火山活动、深成作用、沉积和变形的历史。火山作用发生在至少50 Ma的时间间隔内，始于2747 Ma帕考构造杂岩内火山和火山碎屑单元的沉积。在经历了一段明显的静止期后，随着Normetal和Lac Abitibi地区火山岩的喷发，岩浆活动在2730-2725 Ma恢复。从2715年到大约2698 Ma，火山活动在该地区的大部分地区零星发生，最终在2703到2698 Ma期间布莱克河群喷发。几个大型侵入体产生的年龄表明它们是布莱克河群的深成岩等价物。被认为是在基诺拉造山作用期间侵位的深成岩体，其年龄仅略低于布莱克河群最年轻的火山单位，强调…
U–Pb zircon ages for 15 volcanic and plutonic units in the Noranda and Kirkland Lake areas help constrain the history of volcanism, plutonism, sedimentation, and deformation in the south-central part of the Abitibi belt. Volcanism occurred over an interval of at least 50 Ma, beginning with the deposition of the volcanic and volcaniclastic units within the Pacaud Structural Complex at 2747 Ma. Following a period of apparent quiescence, magmatism resumed at 2730–2725 Ma with the eruption of volcanic rocks in the Normetal and Lac Abitibi area. From 2715 until about 2698 Ma, volcanism occurred sporadically throughout much of the area, culminating in the eruption of the Blake River Group from 2703 to 2698 Ma. Several large intrusive bodies yield ages that indicate that they are plutonic equivalents of the Blake River Group. Plutons that are considered to have been emplaced during the Kenoran orogeny give ages that are only slightly younger than the youngest volcanic units of the Blake River Group, emphasizing ...