Apatite fission track constrains on tectonic activities in Ganzi-Litang gold belt, Qinghai-Tibet Plateau.
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摘要: 甘孜-理塘金矿带形成于三江特提斯巨型造山带中,是三江金矿床的典型代表,具有长期活动的特点,形成了复杂的构造系统。多期构造活动有助于区内深源分散金元素的活化、迁移和富集沉淀,为成矿提供了十分有利的条件。本文介绍了甘孜-理塘金矿带错阿、西冲农、嘎拉、雄龙西和曲开隆洼这5个典型矿区的矿床特征,各矿区共计获得的9个磷灰石裂变径迹年龄值,总体显示为92~88Ma,34~26Ma,17~15Ma和8.1Ma共4个年龄组。4个年龄组均较好的体现了不同地质时期的构造活动及其时限,不仅为该地区提供新的年代学数据,也为该地区的构造演化提供了新证据。通过定量计算,得到本区不同地段的隆升幅度和隆升速率。隆升幅度分为3个量级,即5405m,6023~6272m和6519~6576m。隆升速率变化于0.07~0.81mm/a之间,大致可以分为4个量级,即0.07mm/a,0.18~0.24mm/a,0.32~0.43mm/a和0.81mm/a。两者均具有不同的量级,显示本区差异隆升的特点。Abstract: Ganzi-Litang gold belt belongs to the Sanjiang Tethyan orogenic belt and it is a typical representative of gold mineralization. The Ganzi-Litang fault has experienced multiple tectonic activities that are conducive to the gold element migration and favorable for mineralization. In this paper, a total of five typical deposits, Cuo'a, Xichongnong, Gala, Xionglongxi and Qukailongwa, were introduced. The nine apatite fission track ages are achieved and show four groups of 92~88Ma, 34~26Ma, 17~15Ma and 8.1Ma. According to the sample result, the uplift amplitude and the uplift rate are calculated quantatively, revealing different orders of magnitude and the uneven uplift. The uplift amplitude is divided into three orders of magnitude, which is 5405m, 6023~6272m and 6519~6576m. The uplift rate is divided into four orders of magnitude, which is 0.07mm/a, 0.18~0.24mm/a, 0.32~0.43mm/a and 0.81mm/a. The four age groups accord better with tectonic-magmatic activity and their developing periods. The new geochronological data and new evidences for the tectonic evolution of Ganzi-Litang gold belt are presented.
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Key words:
- Tectonic activity /
- Fission track dating /
- Apatite /
- Ganzi-Litang gold belt /
- Qinhai-Tibet Plateau
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