中新世以来滇西高原内红河流域区的古高程反演  

Paleoelevation reconstruction of Red River drainage areas in Western Yunnan Plateau since Miocene

作　　者：王国芝[1] 初凤友[2] 王成善[1] 

机构地区：[1]成都理工大学地球科学学院 [2]国家海洋局海底科学重点实验室

出　　处：《成都理工大学学报（自然科学版）》2004年第2期118-124,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家973项目(G2000047604)

摘　　要：流经滇西高原的红河水系将高原内被剥蚀下来的物质输送到莺歌海盆地与琼东南盆地中堆积。滇西高原隆升剥蚀区与莺歌海盆地和琼东南盆地堆积区构成了一个相对封闭系统。采用质量平衡法,将莺-琼盆地内的堆积物回剥至隆升剥蚀区,重建了中新世以来滇西高原内红河流域区所达到的可能高程。16.2～19.6Ma前红河流域区海拔高度低于560m,16.2～11Ma前的隆升使高程升至860～950m。经过11～5.3Ma前的剥蚀夷平后,海拔高度降为800m。距今5.3～1.6Ma前的快速隆升,使海拔高度曾达到2600～2725m,隆升幅度达1800～1925m,滇西高原形成。近1.6Ma以来则主要是剥蚀削低,海拔高度从2560m降为2300m。中新世以来红河流域区被剥蚀掉约3900m。The materials denudated from Western Yunnan Plateau were transported to the Yinggehai basin and southeast Hainan basin to accumulate by the Red River drainage. Thus, a relatively closed system formed between uplift and erosion areas in the Western Yunnan Plateau and accumulation areas in the Yinggehai basin and southeast Hainan basin. Based on mass balance between erosion areas and (accumulation) areas, sediments accumulated in catchment basins were distributed back to the erosion areas in plateau, and the paleoelevation can be reconstructed for the Red River drainage areas in Western (Yunnan) Plateau since Miocene. The elevation of the Red River drainage areas was lower than 560 m (during) 16.2~19.6 Ma and attained 860~950m during 16.2~11 Ma, an uplift of 16.2~11 Ma can be suggested. The elevation of the Red River drainage areas was lowered to 800 m because of planation during 11 Ma to 5.3 Ma. The Red River drainage areas were uplifted about 1800~1925 m and attained the (highest) elevation about 2600~2725 m during 5.3~1.6 Ma, Western Yunnan Plateau was formed (basically) and a rapid uplift can be inferred. After that, the Red River drainage areas were denudated and lowered from 2560 m to 2300 m at the present. About 3900 m thickness materials were denudated from the Red River drainage areas since Miocene.

关 键 词：滇西 高原 红河 莺歌海盆地 质量平衡 高程 

分 类 号：P542[天文地球—构造地质学]