Lead and strontium isotope studies of the Boulder Batholith, southwestern Montana

Doe, Bruce R.; Tilling, Robert I.; Hedge, Carl E.; Klepper, M.R.

doi:10.2113/gsecongeo.63.8.884

Cited by 49 publications

(23 citation statements)

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“…The Pioneer Batholith is characterised by iSr values of 0-7113-0-7160 (Arth et al 1986), whereas the Boulder on July 12, 2015 specialpapers.gsapubs.org Downloaded from Batholith is characterised by iSr values of 0-7055-0-7092 (Doe et al 1968). These two batholiths, so discriminated, are neatly separated on the ground by a system of high-angle faults known as the Trusty Gulch-Sawmill Gulch Fault System (Zen 1988b), as is shown on Figure 2. 2.…”

Section: The Late Cretaceous Batholiths Of Southwestern Montanamentioning

confidence: 53%

Using granite to image the thermal state of the source terrane

Zen

1992

Geological Society of America Special Papers

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It should be possible to infer the thermal state of the source terrane for granitic bodies, provided we have independent means to establish the chemical nature of this terrane. The chemical nature of the granitic rocks, including their degree of hydration, implies the solidus temperature. The concentration of the heat-producing radioactive elements in the granite (K, U, and Th) probably provides an upper estimate of their concentration in the source rock, which is an important thermal parameter. The depth and ambient temperature of the country rock into which the granite magma intruded provide useful boundary conditions for the thermal regime at the crustal level of anatexis. These constraints in turn form the bases for estimating the subcrustal thermal flux as well as the effective thermal interface for enhanced heat flow from below that resulted in anatexis. These inferences, in combination with other field-based parameters such as uplift rates and permissible time lapses for the geological events, permit realistic thermal modelling for the formation of granitic batholiths. The procedure is applied to the Late Cretaceous Pioneer and Boulder batholiths in southwestern Montana, U.S.A. The modelling results suggest that mantle upwelling, not subduction or thrust loading, caused anatexis. The isotopic chemistry of the granitic rocks rules out direct mixing of mantle magma, and field relations rule out crustal thinning as causes for partial melting.

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Section: The Late Cretaceous Batholiths Of Southwestern Montanamentioning

confidence: 53%

Using granite to image the thermal state of the source terrane

Zen

1992

Geological Society of America Special Papers

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“…Element suites characteristic of various mineralization-and rock-types in the Highland Mountains--------------36 Previous geological investigations in the region include Winchell (1914), Sahinen (1950), Smedes and others (1968), Tilling and others (1968), Doe andothers (1968), andTilling (1973).…”

Section: Communalities For the Magnetic Fraction Of Panned Concentratmentioning

confidence: 99%

A statistical analysis of geochemical data from rocks and stream deposits in the Highland Mountains, Silver Bow and Madison counties, Montana

Zimbelman¹,

Berger²,

Speckman³

1981

Open-File Report

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“…For this problem the detailed isotopic studies of lead, sulfer and oxygen will be effective (Doe et al, 1968;Chrismas et al, 1969).…”

Section: Petrogenesismentioning

confidence: 99%

“…Rubidium-strontium isochron study provides one of the important informations on the knowledges of the chronology and petrogenesis of rocks, and this technique is also used for the study of ore depositions (Moorbath et al, 1967;Doe et al, 1968;Chrismas et al, 1969).…”

Section: Introductionmentioning

confidence: 99%

A Rb-Sr GEOCHRONOLOGICAL STUDY OF PORPHYRIES IN THE KAMIOKA MINING DISTRICT, CENTRAL JAPAN

Seki

1972

J. Japan. Assoc. Min. Petr. Econ. Geol.

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Lead and strontium isotope studies of the Boulder Batholith, southwestern Montana

Cited by 49 publications

References 0 publications

Using granite to image the thermal state of the source terrane

Using granite to image the thermal state of the source terrane

A statistical analysis of geochemical data from rocks and stream deposits in the Highland Mountains, Silver Bow and Madison counties, Montana

A Rb-Sr GEOCHRONOLOGICAL STUDY OF PORPHYRIES IN THE KAMIOKA MINING DISTRICT, CENTRAL JAPAN

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