geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Synorogenic strata in compressional settings; examples from the Central Andes


, : Synorogenic strata in compressional settings; examples from the Central Andes. Abstracts with Programs - Geological Society of America 35(6): 642

Compressional orogenesis generates an array of sedimentary basins with diagnostic stratigraphic and structural signatures. Accurate identification of these signatures can provide insight into the kinematics and styles of fold-thrust shortening, modes of basin development, and paleoelevation histories of mountain belts. An idealized four-part classification of foreland basin systems (wedge-top, foredeep, forebulge, and backbulge depozones) successfully describes the growth of many modern and ancient systems at low elevations. However, additional basins may develop in orogenic interiors, commonly at high altitudes. Distinguishing low-elevation foreland basins from elevated intermontane basins is possible through structural and stratigraphic studies at local and regional scales, including analysis of basin-margin faults, growth strata, subcrop relationships, provenance, and lithofacies. These studies facilitate reconstructions of long-term shortening records, sediment accommodation mechanisms, and accumulation histories. In the Central Andes, both foreland and intermontane basins recorded Cenozoic shortening, crustal thickening, and uplift. In the Eastern Cordillera of Bolivia, eastward emplacement (insertion) of a basement-involved tectonic wedge, rather than simple thrust-front advance by frontal imbrication, resulted in a pattern of dominantly late Paleogene foredeep evolution followed by early Neogene growth of intermontane basins. The foredeep deposits occur in regionally continuous synclines, are flanked by major structures, concordantly overlie lower Cenozoic strata, contain 1-2 km of upward coarsening fill, exhibit quartzose sandstone compositions, contain a mix of Paleozoic-Mesozoic clasts, display transverse paleocurrents, and include fluvial megafan facies. In contrast, the intermontane basins occur in spatially limited areas, lack basin-margin structures, unconformably overlie a range of deformed Paleozoic and Mesozoic rocks, contain <0.5 km of interbedded fine and coarse sediment, exhibit more lithic sandstone compositions, contain mostly lower Paleozoic clasts, display axial paleocurrents, and include dominantly lacustrine and local alluvial-fan facies. The two-phase history of basin development is consistent with major mid-Cenozoic shortening, thickening, and surface uplift in Bolivia.

US$29.90


Other references

Sterba, G.; Naumann, W., 1966: Electron microscopic studies of the Reissner fibre and the ependyma cells of the spinal cord of Lampera planeri (Bloch). Zeitschrift für Zellforschung und Mikroskopische Anatomie 72(4): 516-524

Sharma, R.Kumar.; Makkar, S.Singh.; Parashar, A., 2011: The necessity of nasal layer closure in cleft palate repair: the unanswered enigma. Plastic and Reconstructive Surgery 128(3): 808; Author Reply 808-9

Vries, E. de; Richter Altschaffer, J.H., 1974: 17: World food crisis and agricultural trade problems. The publication contains two separate papers, A world food crisis by E. de Vries, and Agriculture as a problem in the relations between Europe and the United States by J.H. Richter-Altschaffer. de Vries discusses the prospects for future balance b...

Sorlien Christopher C.; Gratier Jean Pierre; Luyendyk Bruce P.; Hornafius J.S.ott; Hopps Thomas E., 2000: Map restoration of folded and faulted late Cenozoic strata across the Oak Ridge Fault, onshore and offshore Ventura Basin, California. The Ventura basin lies within the east-west--trending active fold-and-thrust belt of the western Transverse Ranges, California. This basin has been the site of significant earthquakes on structures within it and bordering it. The purpose of our st...

Yuan, Q.; Furukawa, T.; Tashiro, T.; Okita, K.; Jin, Z-Hui.; Aung, W.; Sugyo, A.; Nagatsu, K.; Endo, H.; Tsuji, A.B.; Zhang, M-Rong.; Masuko, T.; Inoue, M.; Fujibayashi, Y.; Saga, T., 2016: Immuno-PET Imaging of HER3 in a Model in which HER3 Signaling Plays a Critical Role. HER3 is overexpressed in various carcinomas including colorectal cancer (CRC), which is associated with poor prognosis, and is involved in the development of therapy resistance. Thus, an in vivo imaging technique is needed to evaluate the expressi...

Gong, Y.; Xiong, K-ping.; Mao, C-jie.; Huang, J-ying.; Hu, W-dong.; Han, F.; Chen, R.; Liu, C-feng., 2014: Clinical characteristics in Parkinson's disease patients with cognitive impairment and effects of cognitive impairment on sleep. To analyze the clinical characteristics, correlation factors and clinical heterogeneities in Parkinson's disease (PD) patients with cognitive impairment and identify whether cognitive impairment could influence the aspect of sleep. A total of...

Fidler, J.M., 1978: The induction of hapten specific immunologic tolerance and immunity in bone marrow derived lymphocytes part 4 induction of tri nitro phenyl specific unresponsiveness in vitro with serum from tolerant mice. The serum from mice rendered specifically tolerant (TolS) to the trinitrophenyl (TNP) hapten by the injection of trinitrobenzenesulfonic acid (TNBS) was tested in vitro for its ability to induce unresponsiveness in untreated spleen cells. Conjugat...

Hannes, K.; Aertgeerts, B.; Schepers, R.; Goedhuys, J.; Buntinx, F., 2005: Evidence-based medicine: a discussion of the most frequently occurring criticisms. Since the introduction of evidence-based medicine (EBM) into the field of health care in the early nineties some major criticisms have appeared in scientific literature. One of the most commonly heard objections to EBM is loss of therapeutic freed...

Fang-Yi; Ding-Xiao-Qiang; Zou-Jian-Zhou; Liu-Shi-Zhen; Shu-Xian-Hong; Huang-Guo-Qian; Zhong-Yi-Hong, 2005: The effects of anemia-correction on cardiac structure and function in maintenance hemodialysis patients. Purpose To investigate the changes of the cardiac function and structure in maintenance hemodialysis (MHD) patients, and to analyze the relationship between those changes and anemia. Methods Twenty anemic MHD patients and 20 non-anemic MHD patient...

Popov, I.; Chubarian, S., 1980: Studies of arginase of entomopathogenic bacilli. Biologicheskii zhurnal Armenii 33(4): 426-428