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گت بلاگز Internet Lake-level and salinity reconstruction from diatom analyses in Quillagua formation (late Neogene, Central Andean forearc, northern Chile) / دانلود فایل

مشخصات کلی Lake-level and salinity reconstruction from diatom analyses in Quillagua formation (late Neogene, Central Andean forearc, northern Chile)

نویسنده کتاب (Author):

Bao, Roberto; Sáez, Alberto; Servant-Vildary, Simone; Cabrera, Lluı́s

انتشارات (Publisher):

Elsevier 1999

ویرایش و نوع فایل (Edition/Format):

 Downloadable article : English

منبع (Database):

WorldCat

عنوان ژورنال (Publication):

Bao, R., Sáez, A., Servant-Vildary, S., Cabrera, L., 1999. Lake-level and salinity reconstruction from diatom analyses in Quillagua formation (late Neogene, Central Andean Forearc, northern Chile). Palaeogeography, Palaeoclimatology, Palaeoecology 153, 309-335. http://dx.doi.org/10.1016/S0031-0182(99)00066-8

موضوع (Subject):

Central Andes       Northern Chile       Neogene       View all subjects      

توضیحات خلاصه (Summary):

A sedimentary and micropaleontological study of the Quillagua Formation provides a detailed paleohydrological reconstruction of the lacustrine system which occupied the present-day hyperarid Quillagua–Llamara fore-arc Basin (Northern Chile) from lattermost Miocene (5.8±0.4 Ma) to Early Pliocene times. Diatom and lithofacies analyses were carried out in two correlated stratigraphic sections of the lacustrine system. The Quebrada Temblor section is located at the southern margin of the ancient lake and is directly influenced by the freshwater inputs of a northward flowing fluvial system draining the Precordillera and Calama regions. The Cerro Mogote section occupies a western marginal location in the northern zone sheltered from direct fluvial inputs from the south but subjected to the activity of the alluvial fan systems of the Coastal Range. A mostly shallow oligosaline waterbody occupied the basin during the interval studied, though with fluctuations in salinity and the extent of the inner, open waters. The southern margin sector — represented by Quebrada Temblor — had, in general terms, a palustrine oligosaline character with almost freshwater conditions during certain periods, which favoured the establishment of semi-permanent to permanent freshwater plumes overlying a saline waterbody. Development of shoreline facies subjected to desiccation events was also characteristic at the top of this section. The innermost shallow lacustrine areas — represented by Cerro Mogote — maintained more homogeneous oligosaline characteristics and more persistent open waters. They were also subjected to freshwater pulses mediated in this case by the activity of the terminal alluvial fan zones. Paleohydrological evolution of the basin was strongly conditioned not only by shifts in the climatic–tectonic system but by variations in the local hydrological parameters. Four hierarchical orders of variability in the lake level of the basin were distinguished both by stratigraphic analysis  Read more…

ژانر / فرم:info:eu-repo/semantics/article

موضوع:Internet resource

نوع منبع:Internet Resource, Article

تمام نویسندگان / همکاران: Bao, Roberto; Sáez, Alberto; Servant-Vildary, Simone; Cabrera, Lluı́s

شناسه OCLC:979265137

Language Note:English

فهرست محتوا:0031-0182 http://hdl.handle.net/2183/18282

نویسنده : getblogs