Zircon U-Pb chronology and geochemistry of the Kalagang Formation volcanic rocks in Bayindala area, West Junggar, and their geological significance
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摘要:
西准噶尔巴音达拉地区发育一套酸性火山岩,被称为卡拉岗组,岩石组合以流纹岩、英安岩、流纹质熔结凝灰岩等酸性火山岩为主。本文对卡拉岗组火山岩进行高精度锆石LA-ICP-MS U-Pb测年,获得英安岩和流纹岩的加权平均206Pb/238U年龄分别为(294.4±1.3)Ma(n=9,MSWD=0.8)和(298.4±2.5)Ma(n=9,MSWD=3.4),其形成于早二叠世。岩石地球化学特征表明,卡拉岗组火山岩岩具有高硅(66.69%~75.21%),富碱(Na2O+K2O:6.98%~8.35%),低MgO(0.18%~1.32%),贫钙(0.24%~2.49%)的特征,均属过铝质(A/CNK:1.14~1.33)及高钾钙碱性系列。微量元素数据显示,稀土总量为∑REE为83.82×10-6~197.61×10-6,(La/Yb)N=3.15~12.50,轻、重稀土元素分馏比较明显,轻稀土元素(LREE)较为富集,重稀土元素分布相对平坦,球粒陨石标准化配分模式为右倾型。微量元素富集大离子亲石元素(LILE)Rb、Th、U、K,并亏损高场强元素(HFSE)Nb、Ta、P、Ti。综合最新区域资料及本文研究成果,文章认为研究区早二叠世卡拉岗组火山岩岩浆来源于壳源物质不同程度的部分熔融,残留相中有少量斜长石和角闪石,为后碰撞伸展阶段的产物。
Abstract:Silicic volcanic rocks are developed in Bayindala area of West Junggar. The Kalagang Formation volcanic rocks are mainly composed of rhyolite, dacite, rhyolitic tuff and ignimbrite. This paper reports the results of high-precision zircon LA-ICPMS U-Pb dating of the Kalagang Formation volcanic rocks, which yielded weighted mean 206Pb/238U ages of(294.4±1.3) Ma (n=9, MSWD=0.8, dacite) and(298.4±2.5) Ma (n=9, MSWD=3.4, rhyolite), corresponding to the Early Permian. Petrogeochemical analyses suggest that the Kalagang Formation volcanic rocks are characterized by high silica (SiO2:66.69%-75.21%) and alkali (Na2O + K2O:6.98%-8.35%), and low magnesium and calcium (MgO 0.18%-1.32%, CaO 0.24%-2.49%). They belong to peraluminous (A/CNK:1.14-1.33) and high-K calc-alkaline series. The rocks are poor in rare earth elements with ∑REE being 83.82×10-6-197.61×10-6, enriched in LREE[(La/Yb)N=3.15-12.50] and LILEs (Rb, Th, U, K) and depleted in HFSE, especially Nb, Ta, P and Ti. In combination with previous studies, the authors hold that the Kalagang Formation volcanic rocks in a postcollisional extensional setting were formed by varying degrees of crust partial melting and the residua had a little plagioclase and hornblende.
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Key words:
- Kalagang Formation /
- volcanic rock /
- petrogenesis /
- post-collision /
- West Junggar
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图 1 区域构造及地理位置简图(a, 据Chen Jiafu et al., 2010修改)和巴音达拉地区地质简图(b)
Figure 1.
图 5 卡拉岗组火山岩稀土元素球粒陨石标准化图解(a, 标准化值据Boyoton, 1984)和微量元素原始地幔标准化图解(b, 标准化值据Sun and McDonough, 1989)
Figure 5.
表 1 西准噶尔卡拉岗组火山岩锆石LA-ICP-MS U-Pb定年数据
Table 1. LA-ICP-MS zircon U-Pb dating results for Kalagang volcanic rocks in West Junggar
表 2 卡拉岗组火山岩主量元素(%)与微量元素(10-6)分析结果
Table 2. Major elements (%) and rare earth elements(10-6) of Kalagang Formation volcanic rocks
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