Geochemical evolution of granites from the Achala batholith of the Sierras Pampeanas, Argentina

1990 ◽  
pp. 67-76 ◽  
Author(s):  
Raul Lira ◽  
Alicia M. Kirschbaum
Keyword(s):  
Geochemical Evolution ◽  
Sierras Pampeanas

Delineating Lake Types of the Jurassic East Berlin Formation, Hartford Basin, Newark Supergroup

2016 ◽  
Author(s):  
Alexander A. Conti ◽  
◽  
Elizabeth H. Gierlowski-Kordesch
Keyword(s):  
New England ◽  
Tholeiitic Basalt ◽  
Geochemical Evolution ◽  
Lake Basin ◽  
East Berlin ◽  
Definitive Evidence ◽  
Lacustrine Facies ◽  
Lake Deposits ◽  
First Time ◽  
Biomarker Data

The Mesozoic Hartford Basin, a fault-bounded half-graben in New England, is composed of four sedimentologic units displaying lacustrine, playa, and alluvial conditions separated by three tholeiitic basalt flows. Limited outcrop, however, has restricted analyses across the basin. The Jurassic East Berlin Formation, in particular, crops out only in the southern and northern extents of the basin, exposing the upper 100-118-m of deposits. As a result, a new core analysis across a 600-m-transect of East Berlin rocks has been completed in the central region of the basin, exposing the entire 195-m thickness of the formation for the first time. Cores expose eight 3-m-thick lacustrine mudrock units, the upper six of which are correlative to lake deposits identified in the southern and northern extents of the basin. Additionally, thin chicken-wire evaporites demarcate the lowermost, previously unexposed, lacustrine unit, 7-m beneath a 15-cm-thick tufa horizon. Thin playa deposits and thick sheetflood and Vertisol packages separate these lake sequences over 5-30-m of vertical distance.To supplement these sedimentologic data, and better understand lake geochemistry of the basin during East Berlin time, new biomarker analyses have been applied to each of the eight lacustrine mudrock units for the first time. Biomarker data are useful for determining the lake-basin type, a paleolake classification system derived by Bohacs, Carroll, and others to describe predictable physical and geochemical evolution within rift basins from fluvial facies to over-filled, balance-filled, and under-filled lacustrine facies; subsequently, balance-filled lacustrine facies grade to a terminal fluvial facies during changes in accommodation space through time. While fluvial facies envelope lake deposits within the Hartford Basin, identifying the lake types within the East Berlin has been problematic because of limited exposures. These new sedimentologic and biomarker analyses, however, suggest balance-filled lacustrine conditions at the base of the East Berlin that grade into under-filled conditions upsection. These new biomarker data finally provide definitive evidence for changing lake types during East Berlin time.

GEOCHEMICAL EVOLUTION OF MUNICIPAL WATER IN THE NATURAL HYDROLOGIC SYSTEM

2020 ◽  
Author(s):  
Hunter M. Manlove ◽  
◽  
Jay L. Banner ◽  
Lakin K. Beal ◽  
Darrel M. Tremaine ◽  
...  
Keyword(s):  
Geochemical Evolution ◽  
Municipal Water ◽  
Hydrologic System

Geochemical evolution of the Dras-Kohistan Arc during collision with Eurasia: Evidence from the Ladakh Himalaya, India

Island Arc ◽  
2002 ◽  
Vol 11 (4) ◽  
pp. 255-273 ◽  
Author(s):  
PETER D. CLIFT ◽  
ROBYN HANNIGAN ◽  
JERZY BLUSZTAJN ◽  
AMY E. DRAUT
Keyword(s):  
Geochemical Evolution ◽  
Ladakh Himalaya

Specifics of the late cenozoic geochemical evolution of chloride calcium brines in the Olenek cryoartesian basin

2017 ◽  
Vol 55 (5) ◽  
pp. 442-456 ◽  
Author(s):  
S. V. Alekseev ◽  
L. P. Alekseeva ◽  
S. L. Shvartsev ◽  
N. S. Trifonov ◽  
E. S. Sidkina
Keyword(s):  
Geochemical Evolution ◽  
Late Cenozoic

Geochemical evolution of brines in the Salar of Uyuni, Bolivia

1980 ◽  
Vol 30 (1-2) ◽  
pp. 57-79 ◽  
Author(s):  
S.L. Rettig ◽  
B.F. Jones ◽  
F. Risacher
Keyword(s):  
Geochemical Evolution

Tourmalinites from the Eastern Sierras Pampeanas, Argentina

2004 ◽  
Vol 24 (3-4) ◽  
pp. 229-240 ◽  
Author(s):  
S.M. Tourn ◽  
C.J. Herrmann ◽  
S. Ametrano ◽  
M.K. de Brodtkorb
Keyword(s):  
Sierras Pampeanas ◽  
Eastern Sierras Pampeanas
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