Temperatures outside a cooling intrusive sheet

Jaeger, J. C.

doi:10.2475/ajs.257.1.44

Cited by 150 publications

(78 citation statements)

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“…Due to the chosen grid size of the model, temperatures at the contact plane of the batholith are difficult to estimate. According to the thumb rule of Jäger (1959), a contact peak temperature of 510 C could be predicted. Since information on the contact metamorphism is lacking, this value could not be verified.…”

Section: Thermal Modellingmentioning

confidence: 99%

The Las Chacras-Potrerillos batholith (Pampean Ranges, Argentina): structural evidences, emplacement and timing of the intrusion

Siegesmund

Steenken

Luchi

et al. 2004

International Journal of Earth Sciences

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Within the southern part of the Sierra Pampeanas (the Sierra de San Luis, Argentina), a series of extensive intrusive bodies are regarded to post-date the Famatinian cycle but were emplaced during the Achalian, a period of heterogeneous deformation along crustal scale fault zones. The largest of those is the Las ChacrasPotrerillos batholith that is situated at the northern end of the transpressive, sinistral Guzmµn shear zone. This composite pluton exhibits three sub-domains that comprise two granitoid sub-units each: The southern Potrerillos stock (muscovite-bearing red granite and biotitebearing red granite) and the central (biotite porphyritic granite and giant porphyritic granite) and northern domain (equigranular granite and porphyritic granite) of the Las Chacras stock. The crystallisation ages of the biotite porphyritic granite is around 381 Ma (U/Pb on zircons and Pb/Pb on sphene), while the host rock was already cooled below 350 C at 420 Ma. Thermal modelling approaches favour a pulsed intrusion with a duration of 1.5 Ma. The emplacement was followed by rapid cooling below the muscovite cooling temperature. Biotite cooling ages in different sub-units reflect either a long-lasting cooling history of approximately 30 Ma (which is supported by the modelling) or a reheating effect at around 350 Ma. Devonian-age determinations on the fault rocks and granitoids point to a syn-tectonic emplacement of the batholith. The pluton is interpreted to be positioned at the crossover of sinistral shear zones. The origin of this NNE directed extensional setting in a transpressive regime seems to be related to the transfer of displacement along a secondary set of NNW-trending sinistral faults. The final emplacement is due to a subsequent ballooning of the batholith following the direction of space creation. This model is based on the relative timing of the emplacement sequence and macroscopically visible planar fabrics in the field as well as magnetic fabric data.Our results indicate that the emplacement is syn-kinematic with respect to the Achalian deformation event.

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Section: Thermal Modellingmentioning

confidence: 99%

The Las Chacras-Potrerillos batholith (Pampean Ranges, Argentina): structural evidences, emplacement and timing of the intrusion

Siegesmund

Steenken

Luchi

et al. 2004

International Journal of Earth Sciences

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“…Pore pressure increase is greatest when the lava is emplaced rapidly (Delaney 1982). The minimum contact temperature T contact can be calculated, using the equations given by Jaeger (1959):…”

Section: Pore-fluid Pressurisation Expansion and Migrationmentioning

confidence: 99%

The formation of deep-sea Limu o Pele

Maicher

White

2001

Bulletin of Volcanology

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Deep-sea sheet hyaloclastite consists mostly of sand-sized blocky and splinter-shaped shards, but also contains subordinate mm-to cm-sized thin, curved, and wrinkled plates and sheets of sideromelane. This latter type of shard, termed Limu o Pele, has been observed forming subaerially on Kilauea by entrapment of water in flowing lava followed by expansion of steam to form large bubbles which burst into thin fragments. Deepmarine limu has been inferred, from comparative morphological studies and assessment of physical bubbleforming conditions, to form in a similar way but with the increased ambient pressure and the higher viscosity of water reducing bubble expansion. Differing mechanisms of heat transfer and rates of magma chilling also modify the limu-forming process in the deep sea. This paper evaluates a variety of deep-sea limu-forming processes and develops a new and quantitatively supported model, based on observed limu-forming processes and criteria derived from dive samples and observations at Seamount Six, Cocos Plate. It is inferred that water and/or watersaturated sediment was trapped in extremely thin, fluid and rapidly advancing lava flows by various processes. Bubble formation might also occur during small-scale magma-fountaining driven by magmatic volatile exsolution and extreme vent constriction or during collapse of pillows and rapid drainage of the magma, but we found no deposits clearly resulting from these processes.

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“…The geothermal gradients are linear down to 3.6 km, and at present, we see no problem in projecting these to 5 km for resource estimation purposes. It is suggested that the temperature distribution with depth might approximate the "on-axis" distribution of Jaeger (1959) down to the top of the highest cooling sill. Below that there are expected to be substantial fluctuations above and below partially solidified cooling sheets with the possibility (Jaeger, 1959) of ultra-high temperatures between sheets.…”

Section: Discussionmentioning

confidence: 99%

“…An appropriate distribution is the on-axis cooling distribution of Jaeger (1959). As shown by Jaeger (1959, Fig .…”

Section: A Igneous-related Geothermal Resourcesmentioning

confidence: 97%

Heat flow and hot dry rock geothermal resources of the Clearlake Region, northern California

Burns¹

1996

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Temperatures outside a cooling intrusive sheet

Cited by 150 publications

References 0 publications

The Las Chacras-Potrerillos batholith (Pampean Ranges, Argentina): structural evidences, emplacement and timing of the intrusion

The Las Chacras-Potrerillos batholith (Pampean Ranges, Argentina): structural evidences, emplacement and timing of the intrusion

The formation of deep-sea Limu o Pele

Heat flow and hot dry rock geothermal resources of the Clearlake Region, northern California

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