Fig 1 - uploaded by Qun-Ke Xia
Content may be subject to copyright.
Source publication
Contexts in source publication
Context 1
... eastern part of the North China Craton (NCC, Fig. 1) has very few relict Archean crustal rocks and is a clear example of a 'destroyed craton' (i.e. a craton in which the lithospheric root has been removed; Griffin et al., 1998;Menzies et al., 1993Menzies et al., , 2007Windley et al., 2010). The high-magnesium basalts of the Feixian area in the eastern part of the NCC erupted in the ...
Context 2
... early Cretaceous ( $ 120 Ma) alkali basalts erupted at Feixian ( Gao et al., 2008) in the Shandong province, in the eastern part of the NCC (Fig. 1). Like the contemporary basalts from the nearby Fangchen area ( Zhang et al., 2002), the Feixian basalts are high-magnesium basalts, with MgO up to 14.5 wt% and Mg# value ( ¼100 Â Mg/(Mg þFe) atomic ratio) up to 76 ( Gao et al., 2008). The calculated Mg-Fe partition coefficients (0.30-0.33) between the most forsteritic olivine ...
Context 3
... linear polarized absorbance (40.3) and unpolarized absor- bance (40.15) are high, and the mineral is strongly anisotropic, the unpolarized absorbance is not linearly proportional to thickness and the Beer-Lambert law does not hold (Ková cs et al., 2008;Libowitzky and Rossman, 1996;Sambridge et al., 2008). As shown in Fig. 1 of Ková cs et al. (2008), under a wide range of absorbance properties when polarized absorbance is low (o0.3) and the mineral is less anisotropic (i.e. the difference between the maximum and minimum polarized absorbances is not significant), unpolarized light could provide satisfactory accuracy (i.e. the deviation from the polarized ...
Context 4
... calculate H 2 O content the integral specific absorption coeffi- cient (7.09 ppm À 1 cm À 2 ) of Bell et al. (1995) was used. The uncer- tainty from applying was expected to be o10%, based on the similarity of IR spectra of the Feixian clinopyroxenes with the standard PMR-53 of Bell et al. (1995) (see Fig. 3 and Fig. 1 in Bell et al., 1995). The thickness was measured using a digital micrometer and the precision was o5mm for the $ 0.1 mm-thin sections. Overall, the average uncertainty for H 2 O content should be less than ...
