| Citation: |
SHI Yulian, HUO Qing, PAN Xin, TIAN Tao, LI Shenghu. LA-ICP-MS zircon U-Pb age of the intrusive rocks in Longyangxia area of Qinghai Province and its geological significance[J]. Geological Bulletin of China, 2018, 37(7): 1246-1257.
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LA-ICP-MS zircon U-Pb age of the intrusive rocks in Longyangxia area of Qinghai Province and its geological significance
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Abstract
The intrusive rock types of Longyangxia area in Qinghai Province include syenogranite, monzonitic granite and granodiorite, The rocks have the data Al2O3=11.78%~15.11%, K2O=3.57%~5.58%, A/NK=1.14~1.63, A/CNK=0.87~0.97, and TFeO/(TFeO + MgO)=0.74~0.91, exhibiting the characteristics of metaluminous intermediately high-K calc-alkaline granite. The LAICP-MS detection shows that the 206Pb/238U ages of zircon in syenogranite and monzonitic granite are respectively 243.5 ±2.9Ma (MSWD=5.20) and 247.2±1.7Ma (MSWD=0.97), which are interpreted as the rock emplacement age and represent the geological record of Indosinian Movement's tectonic evolution in the Gonghe aulacogen located in the conjugating and transferring part between the western section of West Qinling orogenic belt and the east Kunlun orogenic belt. The determination of the formation epoch and tectonic environment of the intrusive rocks in Longyangxia area of Qinghai plays a crucial role in the research on the tectonic evolution and dynamics mechanism of Gonghe aulacogen.
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Keywords:
- LA-ICP-MS zircon U-Pb age /
- tectonic significance /
- Longyangxia /
- Qinghai Province
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References
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SHI Yulian, HUO Qing, PAN Xin, TIAN Tao, LI Shenghu. LA-ICP-MS zircon U-Pb age of the intrusive rocks in Longyangxia area of Qinghai Province and its geological significance[J]. Geological Bulletin of China, 2018, 37(7): 1246-1257.
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Figure 1.
Geological sketch map of Longyangxia area, Qinghai Province
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Figure 图版Ⅰ.
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Figure 2.
Silica alkali diagram (a), TFeO-(Na2O+K2O) -MgO diagram (b) and SiO2-K2O diagram (c) of intrusive rocks in Longyangxia area, Qinghai Province
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Figure 3.
Rare earth element distribution patterns of intrusive rocks
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Figure 4.
Trace element spidergram of intrusive rocks
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Figure 5.
Zircon CL images and U-Pb concordia diagram of Early Triassic syenogranite in Longyangxia area, Qinghai Province
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Figure 6.
Zircon CL images and U-Pb concordia diagram of Early Triassic monzonitic granite in Longyangxia area, Qinghai Province
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Figure 7.
R1-R2 diagram(a) and SiO2-TFeO/ (TFeO+MgO)diagram(b) of intrusive rocks in Longyangxia area, Qinghai Province
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Figure 8.
Inactive element discrimination diagrams for granites from intrusive rocks in different tectonic environments in Longyangxia area, Qinghai Province