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首页> 外文期刊>Journal of Asian earth sciences >Unroofing history of the Jambil and Jawar carbonatite complexes from NW Pakistan: constraints from fission-track dating of apatite
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Unroofing history of the Jambil and Jawar carbonatite complexes from NW Pakistan: constraints from fission-track dating of apatite

机译:来自巴基斯坦西北部的Jambil和Jawar碳酸盐复合物的屋顶化历史:磷灰石裂变径迹测年的限制

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The Peshawar Plain Alkaline Igneous Province (PAIP) is exposed north of the Peshawar Plain in NW Pakistan. It stretches from Tarbela in the east up to Loe-Shilman near the Pakistan-Afghanistan border in the west. Within the PAIP, carbonatites are found at Loe-Shilman, Sillai-Patti, Jambil, Koga and Tarbela. Small isolated sill-like bodies and plugs of carbonatites are exposed in the Jambil area, about 10 km SE of Mingora in Lower Swat. Small isolated bodies of carbonatites have also recently been discovered at the locality of Jawar, about 4 km north west of the Sillai Patti carbonatite. Fission-track dating studies on the apatite yielded ages of 15.7 ± 0.4 and 25.2 ± 1.0 Ma for the Jambil and Jawar carbonatites, respectively. Uplift-induced denudation and cooling rates of (0.19 + 0.04) mm y~(-1) and (5.73 ± 1.15)℃ Ma~(-1) for Jambil carbonatite, (0.12 ± 0.03) mm y~(-1) and (3.57 ± 0.73)℃ Ma~(-1) for Jawar carbonatite, and (0.13 ±0.03) mm y~(-1)' and (3.97 ±0.82)℃ Ma~(-1) for Sillai Patti carbonatite, respectively, were estimated. Comparison of the data indicates that all three-carbonatite complexes have experienced similar uplift-induced denudation and cooling rates during the past 25—15 Ma.
机译:白沙瓦平原碱性火成岩省(PAIP)位于巴基斯坦西北部白沙瓦平原以北。它从东部的塔贝拉(Tarbela)一直延伸到西部的巴基斯坦-阿富汗边界附近的Loe-Shilman。在PAIP中,碳酸盐岩分布在Loe-Shilman,Sillai-Patti,Jambil,Koga和Tarbela。在下斯瓦特地区明戈拉东南约10公里处的贾姆比尔地区,暴露出一些小的孤立的基石状小物体和碳酸盐岩塞。最近,在锡拉·帕蒂(Sillai Patti)碳酸盐岩西北约4公里处的贾瓦尔(Jawar)地区也发现了一些小的孤立的碳酸盐岩体。在Japbil和Jawar碳酸盐岩上,磷灰石的裂变径迹约会研究分别产生了15.7±0.4和25.2±1.0 Ma的年龄。詹比尔碳酸盐岩的隆起诱发的剥蚀和冷却速率分别为(0.19 + 0.04)mm y〜(-1)和(5.73±1.15)℃Ma〜(-1),(0.12±0.03)mm y〜(-1)和Jawar碳酸盐岩为(3.57±0.73)℃Ma〜(-1),Sillai Patti碳酸盐岩分别为(0.13±0.03)mm y〜(-1)'和(3.97±0.82)℃Ma〜(-1),被估计。数据比较表明,在过去的25-15 Ma中,所有三种碳酸盐复合物都经历了相似的隆升诱发的剥蚀和冷却速率。

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