| 摘要: |
| 南皮河群位于滇西南昌宁-孟连带西区,其地层序列已受到后期构造作用改造,总体呈无序状态,但其内部的各岩片地层仍保持相对连续的地层层序。据此,我们将南皮河群划分为下、中、上段,对其中各段的沉积特征和构造背景作了详细研究。南皮河群下段为一套浊流、滑塌浊流、碎屑流和等深流沉积类型;中、上段为深水洋盆边缘沉积类型,其沉积构造背景为被动大陆边缘呈拉张状态的深水陆坡-洋盆边缘环境,物源区为西侧的保山-耿马地块。 |
| 关键词: 南皮河群 沉积特征 构造古地理 |
| DOI： |
| 附件 |
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| 基金项目: |
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| STRATIGRAPHY,SEDIMENTOLOGY AND TECTONIC PALAEOGEOGRAPHY OF THE NANPIHE GROUP IN THE CHANGNING-MENGLIAN ZONE,SOUTHWESTERN YUNNAN |
| Jia Jinhua |
| (China University of Mining Science and Technology) |
| Abstract: |
| The Nanpihe Group is located in the western part of the Changning-Menglian zone in southwestern Yunnan.Although its stratigraphic successions have been reworked chaoti-cally by tectonism,there exist a lot of stratal slices with relatively continuous sequences. The sedimentary characteristics and tectonic settings enable the distinction of three mem-bers:upper,middle and lower members.The lower member of the Nanpihe Group is made up of a series of turbidites,fluxoturbidites,debris flow deposits and contourites.The middle and upper members of the group consist of the deposits on the margins of the deep-water oceanic basin.The tectonic settings of the group represent the deep-water exten-sional continental slope to oceanic basin margin environments on the passive continental margin.The principal source of detritus lay to the western Baoshan-Gengma block. |
| Key words: southwestern Yunnan Nanpihe Group sedimentary characteristics tectonic palaeogeography |
