Petrogeochemistry, chronology, Sr-Nd-Pb isotopic compositions, and geological significance of the ore-causative intrusion in the Langdu skarn deposit, northwest Yunnan
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摘要:
滇西北浪都侵入岩体位于义敦岛弧南段的中甸弧，在空间上属浪都夕卡岩型铜矿床的致矿岩体。本文以浪都致矿岩体中石英二长斑岩为对象，对其开展了锆石SIMS（二次离子质谱）U-Pb定年、岩石地球化学和Sr-Nd-Pb同位素研究。锆石U-Pb定年结果显示浪都石英二长斑岩的成岩年龄为219.2±1.8 Ma（2σ，MSWD=1.3，n = 13），与中甸弧中晚三叠世侵入岩体成岩年龄基本一致。浪都石英二长斑岩具有中等SiO2含量（w(SiO2) 为 60.42%~66.44%），高Al2O3（w(Al2O3)为14.56%~16%）和高K2O（w(K2O)为3.49%~4.49%）含量，以富集LREE和Rb、Ba、Sr等大离子亲石元素，相对亏损HREE和Ta、Nb、Ti等高场强元素为特征，在化学成分上属于高钾钙碱性系列。此外，浪都石英二长斑岩的87Sr/86Sr初始值为0.7054~0.7061，εNd(t)值为－3.5~－2.5，且所有样品在Pb同位素构造模式图上均落在造山带演化线附近。结合浪都石英二长斑岩的成岩时代、岩石化学和同位素特征，本文认为浪都致矿岩体形成于晚三叠世甘孜−理塘洋壳西向俯冲增生的构造背景，是交代地幔部分熔融形成的熔体在上升过程中受到下地壳物质混染，并经历分离结晶作用形成的产物。浪都石英二长斑岩的高Sr/Y比值和高V/Sc比值，指示岩浆具有高含量H2O和较高的氧逸度，是该区斑岩−夕卡岩铜矿床形成的关键。
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关键词:
- 浪都 /
- 致矿岩体 /
- 岩石地球化学 /
- 锆石U-Pb年龄 /
- Sr-Nd-Pb同位素
Abstract:The Langdu intrusion in northwestern Yunnan is located in the Zhongdian arc of the southern Yidun terrane and it belongs to the ore-causative intrusion of Langdu skarn-type copper deposit, spatially. This study focuses on the quartz-diorite porphyry within the Langdu ore-bearing intrusion and investigates its zircon SIMS U-Pb dating, rock geochemistry, and Sr-Nd-Pb isotopic composition. The zircon U-Pb dating results reveal a crystallization age of 219.2±1.8 Ma (2σ, MSWD=1.3, n=13) for the Langdu quartz-diorite porphyry, which is consistent with the late Triassic intrusive rocks in the Zhongdian arc. The Langdu quartz-diorite porphyry exhibits medium SiO2 (60.42%–66.44%), high Al2O3 (14.56%–16%), and high K2O (3.49%–4.49%) contents. It is characterized by enrichment of LREE and large ion lithophile elements such as Rb, Ba, and Sr, and relative depletion of HREE and high field strength elements such as Ta, Nb, and Ti, belonging to the high-K calc-alkaline series. Additionally, the initial 87Sr/86Sr ratios of the Langdu quartz-diorite porphyry range from
0.7054 to0.7061 , and εNd(t) values range from －3.5 to －2.5. All samples are plotted near the orogenic evolution line on the Pb isotope evolutionary diagram. Combining the petrological, geochemical, and isotopic characteristics of the Langdu quartz-diorite porphyry, this study suggests that the Langdu ore-bearing intrusion formed in relation to the westward subduction and accretion of late Triassic Garez-Litang oceanic crust. It was a product of partial melting of the metasomatized mantle, mixed with lower crustal material during its ascent, and experienced intense fractional crystallization. The high Sr/Y and high V/Sc ratios of the Langdu quartz-diorite porphyry indicate the characteristics of high-water content and relatively high oxygen fugacity in the magma, which are probably key factors controlling the formation of the porphyry-skarn copper deposit in this region.-
Key words:
- Langdu /
- ore-bearing intrusion /
- rock geochemistry /
- zircon U-Pb age /
- Sr-Nd-Pb isotopes
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图 2 浪都致矿岩体及普朗雪鸡坪斑岩TAS图解（a）（底图据Middlemost, 1994; 碱度分界线据Irvine et al., 1971），K2O-Na2O图解（b）（底图据Middlemost, 1972），K2O-SiO2图解（c）（实线据Peccerillo and Taylor, 1976; 虚线据Middlemost, 1985）和A/NK-A/CNK图解（d）（底图据Maniar and Piccoli, 1989）
Figure 2.
图 4 浪都致矿岩体及普朗雪鸡坪斑岩稀土元素配分模式图（球粒陨石标准化数据来自Sun and McDonough, 1989）（a）和浪都致矿岩体及普朗雪鸡坪斑岩微量元素蛛网图（b）（原始地幔标准化数据来自Sun and McDonough, 1989）
Figure 4.
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