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Title: Reflux revisited

Abstract

The samples and data for this project are derived from 22 test holes drilled to a maximum depth of 91 m, and from rock exposures representing the carbonate section through the Miocene. Dolomite on St. Croix exists in a highly localized region of outcrops and subsurface occurrences in a Miocene-Pliocene reef tract and its related facies. Bioclasts in the dolomitic strata commonly show surprisingly good preservation of microstructure, particularly in large benthic forams and coralline algal clasts. The dolomite is stoichiometrically calcium-rich and exists as euhedral rhombs ranging from 2 to 30 ..mu..m in diameter. The surficial dolomitization occurs in reef, lagoonal, and platform facies that rim the predevelopment shoreline of a coastal lagoon. In the subsurface, dolomitized rock follows the lithifield undersurface of the same lagoon. This spatial distribution of dolomitization suggests a causal relationship between the lagoon hydrology and the process of the dolomitization. The preliminary Sr/sup 87//Sr/sup 86/ isotopic composition of the dolomite is 0.70888, which corresponds to Miocene-Pliocene seawater values, and suggests a Miocene-Pliocene age for the dolomitization event. Stable isotopic values average +2.3 o/oo for delta/sup 13/C and +4.1 o/oo for delta/sup 18/O, both relative to the PDB standard. These data imply that dolomitization tookmore » place by reflux of Pliocene fluids enriched in /sup 18/O. The dolomitization was confined to a fault-bounded region, and affected reef, lagoonal, and platform carbonates.« less

Authors:
; ;
Publication Date:
OSTI Identifier:
6591935
Alternate Identifier(s):
OSTI ID: 6591935
Report Number(s):
CONF-880301-
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting of the American Association of Petroleum Geologists, Houston, TX, USA, 20 Mar 1988
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; DOLOMITE; PETROGENESIS; NATURAL GAS DEPOSITS; MINERALOGY; PETROLEUM DEPOSITS; VIRGIN ISLANDS; PETROLEUM GEOLOGY; BENTHOS; BIOGEOCHEMISTRY; CARBONATE ROCKS; CHEMICAL COMPOSITION; EXPLORATION; ISOTOPE RATIO; MINERALIZATION; MIOCENE EPOCH; PETROCHEMISTRY; PLIOCENE EPOCH; REEFS; STRONTIUM 86; STRONTIUM 87; ALKALINE EARTH ISOTOPES; ALKALINE EARTH METAL COMPOUNDS; AQUATIC ORGANISMS; BETA DECAY RADIOISOTOPES; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; CENOZOIC ERA; CHEMISTRY; ELECTRON CAPTURE RADIOISOTOPES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; FEDERAL REGION II; GEOCHEMISTRY; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; GEOLOGY; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; ISLANDS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LESSER ANTILLES; MAGNESIUM CARBONATES; MAGNESIUM COMPOUNDS; MINERAL RESOURCES; MINERALS; NORTH AMERICA; NUCLEI; OXYGEN COMPOUNDS; RADIOISOTOPES; RESOURCES; ROCKS; SEDIMENTARY ROCKS; STABLE ISOTOPES; STRONTIUM ISOTOPES; TERTIARY PERIOD; USA; WEST INDIES 020200* -- Petroleum-- Reserves, Geology, & Exploration; 030200 -- Natural Gas-- Reserves, Geology, & Exploration

Citation Formats

Gill, I., Moore, C.H., and Aharon, P. Reflux revisited. United States: N. p., 1988. Web.
Gill, I., Moore, C.H., & Aharon, P. Reflux revisited. United States.
Gill, I., Moore, C.H., and Aharon, P. Fri . "Reflux revisited". United States. doi:.
@article{osti_6591935,
title = {Reflux revisited},
author = {Gill, I. and Moore, C.H. and Aharon, P.},
abstractNote = {The samples and data for this project are derived from 22 test holes drilled to a maximum depth of 91 m, and from rock exposures representing the carbonate section through the Miocene. Dolomite on St. Croix exists in a highly localized region of outcrops and subsurface occurrences in a Miocene-Pliocene reef tract and its related facies. Bioclasts in the dolomitic strata commonly show surprisingly good preservation of microstructure, particularly in large benthic forams and coralline algal clasts. The dolomite is stoichiometrically calcium-rich and exists as euhedral rhombs ranging from 2 to 30 ..mu..m in diameter. The surficial dolomitization occurs in reef, lagoonal, and platform facies that rim the predevelopment shoreline of a coastal lagoon. In the subsurface, dolomitized rock follows the lithifield undersurface of the same lagoon. This spatial distribution of dolomitization suggests a causal relationship between the lagoon hydrology and the process of the dolomitization. The preliminary Sr/sup 87//Sr/sup 86/ isotopic composition of the dolomite is 0.70888, which corresponds to Miocene-Pliocene seawater values, and suggests a Miocene-Pliocene age for the dolomitization event. Stable isotopic values average +2.3 o/oo for delta/sup 13/C and +4.1 o/oo for delta/sup 18/O, both relative to the PDB standard. These data imply that dolomitization took place by reflux of Pliocene fluids enriched in /sup 18/O. The dolomitization was confined to a fault-bounded region, and affected reef, lagoonal, and platform carbonates.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

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  • A significant occurrence of vesicoureteric reflux in siblings of children with reflux has been previously suggested. The purpose of this study was to evaluate the incidence of vesicoureteric reflux in asymptomatic siblings of children with vesicoureteric reflux using radionuclide voiding cystography (RNC). A random group of 52 siblings was studied. Their ages were from 2 mos. to 13 yrs. (mean 4 yrs.). Seventy-one percent were female and 29% male, RNC was performed with the patients supine, and Tc-99m pertechnetate (2mCi/1) was infused into the bladder by catheter. A computerized gamma camera recorded the filling and voiding phase of the studymore » at 1 frame/5 sec. Reflux was detected in 40% of the patients. It was bilateral in 17% and unilateral in 23% of the patients. Reflux was identified to the renal pelves in half of the patients. In two of these patients Tc-99m DMSA scans were obtained which revealed significant renal scarring. This study demonstrates the high incidence of reflux of various degrees in these asymptomatic siblings on high risk of developing significant renal disease. Identification and proper treatment of asymptomatic children with vesicoureteric reflux may help prevent the development of renal damage.« less
  • A method is presented for the determination of the optimum reflux ratio for a distillation column. The optimum reflux ratio is that which maximizes the total column product value, less energy costs. An example is given for the determination of the optimum reflux ratio for a toluene-xylene splitter. In addition, a reflux ratio report is proposed as a means of monitoring reflux ratios. The report is structured so that it can be developed and implemented with only basic process engineering skills and at low cost.