A modified genetic model for multiple pulsed mineralized processes at the giant Qulong porphyry Cu-Mo mineralization system

矿化(土壤科学) 地球化学 地质学 遗传模型 矿物学 化学 土壤科学 生物化学 基因 土壤水分
作者
Youye Zheng,Xin Chen,Sangjiancuo Luo,Qiong Ci,Le Zhang,Jiangang Wei,Shunbao Gao,Hao Lin
出处
期刊:American Mineralogist [Mineralogical Society of America]
卷期号:109 (10): 1705-1716 被引量:2
标识
DOI:10.2138/am-2023-9145
摘要

Abstract Porphyry copper deposits are economically significant sources of Cu and Mo, formed when metal-rich fluids precipitate at shallow levels, exsolving from underlying magmatic reservoirs at depth. However, the origin and evolution of these metal-rich fluids, whether through episodic enrichment from multiple pulses or a single continuous fluid-release event, remain a subject of controversy. To gain deeper insights into these processes, data on cathodoluminescence (CL) imaging, in situ trace elements, and Sr isotopes of newly discovered scheelite (Sch 1, Sch 2, and Sch 3) found in three generations of vein types within the giant Qulong porphyry Cu-Mo mineralization system are presented. The anhedral Sch 1 occurs in quartz + magnetite + anhydrite + chalcopyrite veins, exhibiting no obvious zoning in the CL image. These scheelite samples show high concentrations of Mo, Nb, Ta, and 87Sr/86Sr ratios ranging from 0.70688 to 0.71109. Moreover, they demonstrate enriched rare earth elements (REE) and negative Eu anomalies in the chondrite-normalized pattern, indicative of their formation in relatively oxidized metal-rich fluids during the early high-temperature alteration stage. Among the discovered scheelite varieties, the most volumetrically significant is the subhedral Sch2, which occurs in veins composed of quartz + pyrite + chalcopyrite. In its central region (Sch 2a), Cu-rich cores are dispersed, surrounded by an oscillatory Cu-poor mantle and rim (Sch 2b and 2c), as observed in the CL image. When compared to Sch 1, Sch 2 exhibits lower levels of REE, Nb, Ta, Mo, and 87Sr/86Sr ratios (ranging from 0.70502 to 0.70578), but higher Cu concentration and positive Eu anomalies. The gradual decrease in Cu content from the core to rim in Sch2, along with its rim’s intergrowth with sulfide, suggests the precipitation of Cu during the second pulse of fluids. Euhedral Sch 3 is found in relatively moderate-temperature mineral assemblages within quartz + galena + sphalerite + molybdenite veins. It displays an oscillatory pattern with a Mo-rich core (Sch 3a), an extremely Mo-rich mantle (Sch 3b), and a Mo-poor rim (Sch 3c) in the CL image. Sch 3 shows lower REE, Cu, and Pb contents but variable Mo concentrations in different domains while consistently recording 87Sr/86Sr ratios ranging from 0.70498 to 0.70542. These characteristics indicate the precipitation process of Mo and Pb during the third pulse of fluid evolution. The observed shift in mineral assemblages, metal contents, and Sr isotopic components from Sch 1 to Sch 3 reflects the occurrence of different fluid pulses within a cooling porphyry Cu-Mo mineralization system. Overall, the three generations of scheelite found at the Qulong porphyry Cu-Mo deposit indicate the occurrence of multiple pulsed flows of magmatic fluids, revealing a more complex fluid evolution for porphyry Cu deposits than previously recognized. Notably, Sch 1 exhibits relatively high 87Sr/86Sr ratios, similar to the post-ore mafic porphyries, which are higher compared to Sch 2 and Sch 3, showing 87Sr/86Sr ratios similar to the pre- and syn-ore host granite and porphyry. This result implies that mafic magma has significantly contributed to the formation of the first pulse of magmatic fluids, whereas synore granitic magma contributed to the ore fluids responsible for forming the veins containing Sch 2 and Sch 3 in the later stage. Therefore, we propose that volatiles from mafic magma, injected into the porphyry metallogenic system, play a crucial role in the formation of porphyry Cu deposits. Additionally, for the first time, the presence of Cu-Mo-W metal endowment in the porphyry Cu deposits of the Gangdese magmatic belt is identified, providing valuable new insights into the metallogeny of porphyry Cu deposits and offering promising opportunities for tungsten exploration in the collision zone.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
芷兰丁香完成签到,获得积分10
1秒前
科研通AI2S应助欣喜谷槐采纳,获得10
1秒前
Tomice发布了新的文献求助10
2秒前
Lynn完成签到 ,获得积分10
4秒前
Roxy发布了新的文献求助10
4秒前
4秒前
Lucas应助11122采纳,获得10
5秒前
6秒前
7秒前
Ava应助huang1499采纳,获得10
8秒前
8秒前
烟花应助花生油炒花生米采纳,获得10
10秒前
Nagi参上完成签到,获得积分10
11秒前
871004188完成签到,获得积分10
12秒前
祁祁完成签到,获得积分10
13秒前
不吃西瓜发布了新的文献求助10
14秒前
量子星尘发布了新的文献求助100
15秒前
努力科研的小吴完成签到,获得积分10
16秒前
万能图书馆应助欣喜谷槐采纳,获得10
17秒前
司藤完成签到 ,获得积分10
18秒前
23秒前
23秒前
赵志峰完成签到,获得积分20
29秒前
30秒前
不吃西瓜完成签到,获得积分10
30秒前
NIUBEN发布了新的文献求助30
34秒前
碧蓝的南晴完成签到,获得积分10
36秒前
坦率夜山关注了科研通微信公众号
36秒前
36秒前
37秒前
Baboonium完成签到,获得积分10
39秒前
40秒前
慕青应助leo198611采纳,获得10
41秒前
41秒前
zzzzzz发布了新的文献求助10
42秒前
乐观思萱发布了新的文献求助10
44秒前
45秒前
帅气凝云完成签到 ,获得积分10
48秒前
彭于晏应助乐观思萱采纳,获得10
52秒前
JamesPei应助zs采纳,获得10
53秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3971606
求助须知:如何正确求助?哪些是违规求助? 3516269
关于积分的说明 11181779
捐赠科研通 3251428
什么是DOI,文献DOI怎么找? 1795887
邀请新用户注册赠送积分活动 876110
科研通“疑难数据库(出版商)”最低求助积分说明 805246