References
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Heat Flow Determinations for the Australian Continent: Release 4
Oceanic heat flow: Implications for global heat loss
A new dataset of nearly 15,000 oceanic heat flow measurements is analyzed to determine the conductive heat loss through the seafloor. Many heat flow values in seafloor younger than 60 Ma are lower than predicted by models of conductively cooled lithosphere. This heat flow deficit is caused by ventilated hydrothermal circulation recharge and discharge at crustal outcrops or areas of thin sedimentary cover. Filtering heat flow data, retaining only sites with >400 m of sediment cover and located >60 km from the nearest seamount, minimizes the effect of hydrothermal ventilation. Filtered heat flow exhibits a much higher correlation coefficient with …
Possible kilometer-scale hydrothermal circulation within the Iheya-North field, mid-Okinawa Trough, as inferred from heat flow data
We obtained 78 heat flow measurements during 2002-2008 in the area of the Iheya-North hydrothermal field in the middle Okinawa Trough, in order to clarify the spatial extent of the hydrothermal circulation system. Within a small basin surrounded by knolls, three distinct zones are identified with different heat flow values, which we termed the high-, moderate-, and low-heat-flow zones. In the high-heat-flow zone located near the western edge of the basin, extremely high and widely scattered heat flow values (0.01-100 Wm<sup>-2</sup>) were measured within ∼500 m of the active hydrothermal mounds, venting black smoker fluid of maximum 311 …
A preliminary regional geothermal assessment of the Gulf of Suez, Egypt
The tectonic setting of Egypt, in the northeastern corner of the African continent, suggests that it may possess significant geothermal resources, especially along its eastern margin. The most promising areas for geothermal development in the NW Red Sea-Gulf of Suez rift system are locations along the eastern shore of the Gulf of Suez that are characterized by surface thermal manifestations, including a cluster of hot springs with varied temperatures. The Gulf of Suez region is one of the most interesting geothermal areas in Egypt because of the high temperatures of its springs. Geothermal studies were performed based on bottom-hole temperature …
Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka
Heat flow measurements were carried out in 2009 offshore Kamchatka during the German-Russian joint-expedition KALMAR. An area with elevated heat flow in oceanic crust of Cretaceous age - detected similar to 30 yr ago in the course of several Russian heat flow surveys - was revisited. One previous interpretation postulated anomalous lithospheric conditions or a connection between a postulated mantle plume at great depth (>200 km) as the source for the observed high heat flow. However, the positive heat flow anomaly - as our bathymetric data show - is closely associated with the fragmentation of the western flank of the …
Geothermal studies of the Outokumpu Deep Drill Hole, Finland: Vertical variation in heat flow and palaeoclimatic implications
Detailed geothermal studies of deep drill holes provide insights to heat transfer processes in the crust, and allow separation of different factors involved, such as palaeoclimatic and structural conductive effects as well as advective fluid flow effects. We present high resolution geothermal results of the 2516 m deep Outokumpu Deep Drill Hole in eastern Finland drilled in 2004-2005 into a Palaeoproterozoic formation with metasedimentary rocks, ophiolite-derived altered ultramafic rocks and pegmatitic granite. The down-hole temperatures have been logged five times after end of drilling and extend to day 948 after drilling. The hole is completely cored (79% core coverage) and …
Heat flow distribution and thermal structure of the Nankai subduction zone off the Kii Peninsula
Detailed heat flow surveys were carried out in the central part of the Nankai Trough southeast of the Kii Peninsula (off Kumano) for investigation of the thermal structure of the subducting plate interface. At stations in the Kumano Trough (forearc basin) and its vicinity, long-term monitoring of temperature profiles in surface sediments was conducted because bottom water temperature variations (BTV) significantly disturb subbottom sediment temperatures. Heat flow values were successfully determined at seven stations by removing the influence of BTV from temperature records for 300 to 400 days. The surface heat flow data were combined with estimates from depths of …
Heat Flow Determinations for the Australian Continent: Release 3
Borehole temperature logging and characteristics of subsurface temperature in Sichuan Basin
Based on temperature logging of 9 boreholes and thermal conductivity measurements of 297 samples from the Sichuan Basin, 9 highly qualified terrestrial heat-flows are reported. Combining published data, contour maps of geothermal gradient and heat flow are presented. The results show that variations of thermal conductivity of sedimentary rocks in the Sichuan Basin are mainly controlled by lithology, rather than current burial depth. Present-day geothermal gradient in the basin ranges from 17. 7 to 33. 3 degrees C/km with a average of 22. 8 degrees C/km and the heat flow from 35. 4 to 68. 8 mW/m(2) with a average …
Global heat flow trends resolved from multiple geological and geophysical proxies
Because global coverage of heat flow measurements is still poor in many areas, empirical estimators based on the geology, the thermotectonic age or the velocity structure of the upper mantle have often been used to affect an estimate to regions where such measurements are absent. On the basis of the assumption that heat flow is strongly related to its geodynamic environment, one may integrate multiple proxies derived from a large body of global geological and geophysical data sets assembled during the past decades; these should help to better capture the variety of present-day settings. This idea is illustrated through two …
Heat flow along the NanTroSEIZE transect: Results from IODP Expeditions 315 and 316 offshore the Kii Peninsula, Japan
We report detailed thermal measurements undertaken during Integrated Ocean Drilling Program (IODP) Expeditions 315 and 316 along the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) transect offshore the Kii Peninsula, Japan. Geothermal objectives included determining thermophysical rock properties of the cored material and characterizing the background thermal regime along this transect. New thermal conductivity measurements made with a divided bar are reported and supplement shipboard full-and half-space thermal conductivity measurements for a total of 938 thermal conductivity measurements. Thermal conductivity varies between about 1.0 W m(-1) K-1 near the seafloor to 1.6 W m(-1) K-1 at a depth of 1 km. …
Heat flow determinations for the Australian Continent: Release 2
Heat flow analysis on EST433
Determination of geothermal gradient and heat flow distribution in Delta State, Nigeria
Thermal properties of the AND-2A borehole in the southern Victoria Land Basin, McMurdo Sound, Antarctica
The ANDRILL (Antarctic Geological Drilling Program) Southern McMurdo Sound Project (SMS) drilled a 1138-m-deep bore-hole (AND-2A) within Neogene strata in the southern Victoria Land Basin of the West Antarctic Rift in the Ross Sea, Antarctica, during the 2007-2008 austral spring. An extensive downhole logging program was carried out in the SMS borehole that included temperature and spectral gamma ray logs. These logging data were combined with lab measurements of the thermal conductivity of core samples to deduce several thermal parameters of the borehole country rock. The results indicate a bottom-hole temperature of 57.8 degrees C and an average temperature gradient …
Atlas zasobów geotermalnych formacji mezozoicznej na Niżu Polskim (Atlas of geothermal resources of mesozoic formations in the Polish Lowlands)
Thermal regime of the northwest Indian rifted margin – Comparison with predictions
We use a simple approach to estimate the present-day thermal regime along the northwestern part of the Western Indian Passive Margin, offshore Pakistan. A compilation of bottom borehole temperatures and geothermal gradients derived from new observations of bottom-simulating reflections (BSRs) allows us to constrain the relationship between the thermal regime and the known tectonic and sedimentary framework along this margin. Effects of basin and crustal structure on the estimation of thermal gradients and heat flow are discussed. A hydrate system is located within the sedimentary deep marine setting and compared to other provinces on other continental margins. We calculate the …