• 责任者：Wang Qingchen (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China)
• 刊名：Chinese Journal of Geology
• 出版年：2013
• 卷期：48(1)
• 关键词：造山带 ; orogenic belts ; 盆地演化 ; basin evolution ; 大别山 ; Dabie Mountains
• 页码：p.1-31
• 图表：illus., 85 refs.
• 分类号：0300
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

The Dabie orogenic belt was buih up by Mesozoic collision and its uplift caused depression of the Hefei Basin. The analysis on Jurassic clastic rocks in the Hefei Basin shows that there are two types of pebble in conglomerate,with one being high pressure metamorphic eclogite and the other ultra-high pressure metamorphic eclogite. Detrital mica in sandstone includes phengite that indicates high and ultra-high pressure metamorphism. Accumulating sequence reconstructed in basin is lithic material from non-high pressure metamorphic rocks, that from high pressure metamorphic rocks, that from ultra-high pressure metamorphic rocks. In combined with reconstructed structure of the Dabie orognenic belt,erosion sequence could be inferred as following：the non-high pressure metamorphic rocks including schist, gneiss and marble were first eroded and accumulated in the basin when the Sanjianpu formation（J2s）began to deposit; then the high pressure metamorphic rocks were eroded during the early deposition of the Sanjianpu Formation（J2s）; in the end,the ultra-high pressure metamorphic rocks were eroded during the early deposition of the Fenghuangtai Formation（J~）.  The Tianshan Mountain is a typical intra-continental orogenic belt, uplifting as a distal effect of collision between India and Eurasia plates. The uplift of the Tianshan orogenic beltcould be reconstructed in the new age framework by combining data of detrital composition of Tertiary sedimentary rocks and apatite fission track of granite. Two abrupt changes in pebble composition from conglomerate appear separately in spans of 75 -35 Ma, 26 -17 Ma and 12  - 8 Ma,when provenance shifted from the middle Tianshan to the South Tianshan. Composition changes in sandstone and heavy mineral indicate provenance changes occurred in 124 Ma, 26 （-24） Ma and 15（-12） Ma. Apatite fission track analysis further displayed differential uplift of the Tianshan since Cretaceous. The first phase of uplift started at the southern Central Tianshan during 124 -80 Ma with a southward propagation. Uplift in the second phase started at the northern Central Tianshan between- 100 to- 60 Ma, and propagated also southward. Uplift in the third phase started at the northern Central Tianshan by about 50 Ma and propagated both northward and southward. Lately, an independent uplift started in the south Tianshan during 15 （ - 12） Ma.  The above two case studies tell us that the deposition process in basin just likes stack process,＂ Last-In/First-Out＂, while erosion of orogenic belt does not because of differential uplift. To say that deposition sequence in basin is a mirror image of erosion in orogenic belt can sometimes result in mistakes. One must study with caution Case by case.