U–Pb Geochronology of the Baguio Area, a Major Mining District in Northern Luzon (Philippines)

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2024-10-14 DOI:10.1111/iar.12535
Monika Walia, Rolando Pena, Ulrich Knittel
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Abstract

The Baguio District, located in northern Luzon (the Philippines), is one of the major gold and copper mining districts in the Philippines and SE Asia. U–Pb zircon ages for igneous rocks and for detrital zircons extracted from sediment samples of the principal formations of the Baguio District reveal major magmatic pulses at ca. 1, 3, 16, and 20 Ma. The oldest zircon dated in this study has an age of 27.3 ± 1.6 (2σ) indicating earlier activity which has, however, left only a small imprint on the zircon inventory of the sediments. The absence of older zircons suggests that northern Luzon formed as an intra-oceanic arc. Zircon Hf isotope data suggests that the magmas, from which the zircons crystallized, were derived from time-integrated highly depleted mantle sources, compatible with an intra-oceanic origin of the island. The results of the U–Pb dating of zircons mostly confirm previous estimates of the ages of the rock units. Mid-Miocene ages obtained for samples thought to represent the Pugo Formation, the lowermost unit, which is thought to be Cretaceous-Eocene in age, most likely date magmatic rocks that intruded the Pugo Formation.

Abstract Image

菲律宾北吕宋岛主要矿区碧瑶地区的铀-铅地质年代学
碧瑶地区位于菲律宾吕宋岛北部,是菲律宾和东南亚主要的金矿和铜矿开采区之一。从碧瑶地区主要地层的沉积物样本中提取的火成岩和碎屑锆石的U-Pb锆石年龄显示,主要的岩浆脉冲发生在约1、3、16和20Ma。1、3、16 和 20 马年。本研究中年代最久远的锆石的年龄为 27.3 ± 1.6 (2σ),这表明较早的活动只在沉积物的锆石库存中留下了很小的印记。较早锆石的缺失表明,吕宋岛北部是作为洋内弧形成的。锆石 Hf 同位素数据表明,锆石结晶的岩浆来自时间整合的高贫化地幔源,这与该岛的洋内起源相吻合。锆石的 U-Pb 定年结果在很大程度上证实了之前对岩石单元年龄的估计。被认为代表普戈地层的样本获得了中新世年龄,最下层单元被认为是白垩纪-始新世年龄,很可能是侵入普戈地层的岩浆岩。
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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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