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@PHDTHESIS{Buysch:62145,
author = {Buysch, Arno},
othercontributors = {Clauser, Christoph},
title = {{D}ie syn- bis post-magmatische {E}ntwicklung des {M}auna
{K}ea/{H}awaii, {USA} : {I}nterpretation geophysikalischer
{B}ohrlochdaten und petrophysikalischer {K}erndaten aus der
{T}iefbohrung '{H}awaii {S}cientific {D}rilling {P}roject,
{HSDP}-2'},
address = {Aachen},
publisher = {Publikationsserver der RWTH Aachen University},
reportid = {RWTH-CONV-123735},
pages = {VII, 151 S. : Ill., graph. Darst.},
year = {2005},
note = {Aachen, Techn. Hochsch., Diss., 2005},
abstract = {In 1999, an extensive logging program with standard logging
tools was run by the GFZ Potsdam in the scientific drillhole
‘Hawaii Scientific Drilling Program - HSDP-2’ on the
island of Hawaii/USA. Measurements of electrical
resistivity, gamma-ray activity, and Vp-velocity were
performed in an open-hole environment from 550 - 2720 mbsl
(meter below sea level). The drilled section comprises
basaltic formations of subaerial and submarine environment
of various amount, morphology, and physical properties.
Additionally, a broad range of petrophysical, geochemical,
and petrographical core measurements were carried out. The
present study deals with the interpretation of the logging
data with regard to the primary and secondary evolution of
the volcano Mauna Kea. This is achieved in different steps,
namely (1) a re-classification of the current
lithostratigraphic profile on the basis of the log data, (2)
the combination of various core measurements and logging
data, and finally (3) by setting up a volcano model, which
integrates all information into an overall picture of the
volcano evolution. Downhole measurements in HSDP-2 drillhole
revealed many unexpected effects within geochemically
similar rock types. Data recorded in different
lithostratigraphic and/or structural environment of the
drilled subaerial and submarine lava flows were influenced
by secondary processes. Fluid flow, brecciation, and the
evolution of alteration minerals lead to deviating results
in gamma-ray and resistivity measurements. Data from
downhole measurements were generally corrected for
environmental influences. The re-classification of the
current lithological profile resulted in a modified
lithostratigraphic column. This column represents a
differentiation of the drilled section into nine larger
units, named log units LU 1 - 9. These log units show
clearly distinguishable petrophysical features, which are
connected to primary lithology as well as to secondary
effects, such as compaction or alteration. For the detection
of possible fluid pathway zones porosity and permeability
profiles were calculated, applying an integration of
conductivity and permeability measurements on cores with
downhole resistivity measurements. Beside a gradual decrease
of porosity and permeability with depth, the application
revealed seven porosity/permeability transitions, which are
related to lithological as well as hydrostratigraphical
changes. These 'bounds' correlate with an Illite/Smectite as
well as with a Smectite/Smectite-Zeolite border based on
alteration mineral research results, and with a so-called
alteration index performed on the basis of the spectral
gamma-ray. Generally, the correlations of various events
point to a relatively lithological independence of
alteration phases. The overall combination and integration
of the information from the various measurements leads to
the perception that the shield volcano Mauna Kea, although
almost at the end of its life-cycle, is still subject to and
highly influenced by ongoing changes. These changes among
which the observed fluid flow along permeable basalt and
breccia zones is recently the most important one, have a
deep impact on the entire volcano evolution.},
cin = {500000},
ddc = {550},
cid = {$I:(DE-82)500000_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-opus-12288},
url = {https://publications.rwth-aachen.de/record/62145},
}
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