Citation
Hydrochemistry, hydrology, and morphology of the Caves branch karst, Belize

Material Information

Title:
Hydrochemistry, hydrology, and morphology of the Caves branch karst, Belize
Creator:
George Veni ( suggested by )
Publication Date:
Language:
English

Subjects

Genre:
Thesis / Dissertation
serial ( sobekcm )
Location:
Belize

Notes

General Note:
Hydrochemistry, hydrology, and morphology of the Caves branch karst, Belize by Tom Miller, B.A. A thesis submitted to the faculty of Graduate Studies in partial fulfilmet of the requirements for the degree Doctor of Philosophy, McMaster University October, 1981Abstract: An extensive karst developed on Cretaceous limestones in Belize, Central America, was the site of a hydrochemical, hydrologic, and morphologic study. This thesis describes the results of analysis of several hundred water samples from this humid tropical environment (mean annual rainfall - 2376 mm; temperature - 24.5#8451;). An unusual positively correlated discharge/total hardness loading curve in a major cavern conduit is explained as due to a two-component mixing model. Hydrologic modelling, soil CO 2sampling, and discriminant analysis were used to infer the interior structure of a karst aquifer. Minimum effective porosity was determined to be 0.7%. Mean areal hardness of 187 mg/L (as CaCo 3) was found for springs draining the aquifer, indicating a denudation rate of about 90 m 3/Km 2/year. Aqueous P CO 2of these springs was 1.1%, significantly higher than the 0.7% of mean karst soil CO 2levels. This implies open system calcite solution evolution and/or internal CO 2production within the aquifer. Various morphologic analyses suggest the cockpit-type surfaces of numerous karsts in the tropics may be significantly due to disaggregation of existing topographic lows originally formed by creation of a fluvial topography. These fluvial valleys acted as favorable sites for concentration of aggressive water and consequent cockpit formation. Over 40 km of cavern passage were explored in the Caves Branch, including one of the largest tropical cavern systems known. Cavern development appeared to have been chiefly influenced by regional fracture patterns and topographic dip. The present development wasa completed by at least 140,000--215,000 eyars B.P., accordig to results of speleothems dated by the uranium/thorium disequilibrium method.
Restriction:
Open Access
General Note:
See Extended description for more information.

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
K26-01536 ( USFLDC DOI )
k26.1536 ( USFLDC Handle )
13998 ( karstportal - original NodeID )

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Karst Information Portal

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Full Text
Description
Hydrochemistry, hydrology, and morphology of the Caves
branch karst, Belize by Tom Miller, B.A.
A thesis submitted to the faculty of Graduate Studies in
partial fulfilmet of the requirements for the degree Doctor of
Philosophy, McMaster University October, 1981Abstract:
An extensive karst developed on Cretaceous limestones in
Belize, Central America, was the site of a hydrochemical,
hydrologic, and morphologic study. This thesis describes the
results of analysis of several hundred water samples from this
humid tropical environment (mean annual rainfall 2376 mm;
temperature 24.5℃). An unusual positively
correlated discharge/total hardness loading curve in a major
cavern conduit is explained as due to a two-component mixing
model. Hydrologic modelling, soil CO
2sampling, and discriminant analysis were used to
infer the interior structure of a karst aquifer. Minimum
effective porosity was determined to be 0.7%. Mean areal
hardness of 187 mg/L (as CaCo
3) was found for springs draining the aquifer,
indicating a denudation rate of about 90 m
3/Km
2/year. Aqueous P CO
2of these springs was 1.1%, significantly higher
than the 0.7% of mean karst soil CO
2levels. This implies open system calcite solution
evolution and/or internal CO
2production within the aquifer. Various morphologic
analyses suggest the cockpit-type surfaces of numerous karsts
in the tropics may be significantly due to disaggregation of
existing topographic lows originally formed by creation of a
fluvial topography. These fluvial valleys acted as favorable
sites for concentration of aggressive water and consequent
cockpit formation. Over 40 km of cavern passage were explored
in the Caves Branch, including one of the largest tropical
cavern systems known. Cavern development appeared to have been
chiefly influenced by regional fracture patterns and
topographic dip. The present development wasa completed by at
least 140,000--215,000 eyars B.P., accordig to results of
speleothems dated by the uranium/thorium disequilibrium
method.



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