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Petrology of marble and peridotite in the Seiad ultramafic complex, northern California, USA (1986)

LIEBERMAN, J. E. ; RICE, J. M.

Oxford, UK : Blackwell Publishing Ltd

Journal of metamorphic geology 4 (1986), S. 0

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ISSN: 1525-1314

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: Abstract Peridotite and infolded marble of the Seiad ultramafic complex were recrystallized in the upper amphibolite facies as part of the regional progressive metamorphism of the Rattlesnake Creek terrane. Field relations, including the occurrence of metarodingites, and metasomatic zones between dissimilar rock types, demonstrate that the metasediments and serpentinized ultramafic rocks were juxtaposed prior to regional, barrovian metamorphism. Temperatures are estimated to have reached 760–800°C at pressures of 7–8 kbar during the peak of metamorphism. Four low-variance parageneses have been identified within a small (3 km2) area of the complex, which may reasonably be assumed to have formed under the same P and T conditions. Isobaric T-Xco2 diagrams of appropriate equilibria are presented for three different internally consistent sets of thermodynamic data. Despite the seemingly small numerical differences between the standard state thermodynamic properties of the data sets, only one diagram allows the four observed assemblages to coexist within a reasonable temperature range. All three phase diagrams require differences in fluid composition on the scale of a thin section; strong evidence for effective control of pore fluid composition by local mineral reactions during metamorphism.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1525-1314.1986.tb00346.x

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Calculation of cranial capacity from linear dimensions (1964)

Dekaban, Anatole ; Lieberman, J. E.

New York, NY [u.a.] : Wiley-Blackwell

The @Anatomical Record 150 (1964), S. 215-219

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ISSN: 0003-276X

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Medicine

Notes: Physical anthropological and x-ray linear measurements of length, breadth and height of 28 dried skulls were made. The means and variances of these measurements were calculated and are given in tables. Next, the cranial capacity of these skulls was measured with mustard seeds (this method was validated using water measured skull) and the means and variances are given separately for males and females. Two formulae: (1) Lee's - Males, 0.365 (L × B × H) + 359.34; Females, 0.375 (L × B × H) + 296.40. (2) Spheroid-π/6 (L × B × H) were applied to calculate cranial capacity (in milliliters) from the linear anthropological and radiological dimensions (in centimeters). The results of the volumes thus obtained were compared to each other and to the control volume of the respective skulls. It was concluded that both the Lee's and Spheroid formulas for calculating the volume showed acceptably small difference from the respective control values. However, the Lee's method gave closer to control volumes for anthropological measurements whereas the Spheroid method gave closer to control volumes for x-ray measurements.

Additional Material: 5 Tab.