. Materials and methods
The dinosaur bones were collected during field work in 1999, 2000, and 2002 in Northern Qitai county, about 35 km north of Jiangjun Miao (“General's temple”) near the road Nr. 216, which leads from Qitai to the northern margin of the Junggar Basin (Fig. 1). The geographic positions referred to the WGS 84 are 44°48′45″N and 90°02′43″E at the southern slope of the Kelameili Mountain. In the center of the Kelameili Mountain a fault in WNW–ESE direction separates a long Paleozoic ophiolite belt in the NE from Mesozoic coal-bearing fluviatile and limnic sediments in the SW. During field work, more than 100 small bone fragments from unidentified dinosaurs were collected. Fourteen of these specimens were used for the preparation of 19 thin sections to investigate the taphonomic history and the bone histology. The bone fragments showed patchy black mineralizations in the capillary system of the bones as well as in the inter-trabecular space. Some fragments with these black mineralizations were powdered and several milligrams of bone powder were analysed with X-ray diffraction to identify the mineralogy of the bone and the diagenetic mineral infillings. The X-ray diffraction patterns were recorded using a Siemens X-ray diffractometer D5000 at the Steinmann-Institute of the University of Bonn with CuKα radiation (λ = 1.54178 Å). The X-ray generator worked at a power of 45 kV and 40 mA. The goniometer was equipped with a graphite secondary monochromator in the diffracted beam and the patterns were collected with 0.02° of step size. The powder patterns were collected in the angular range 4° to 70° in 2θ, with counting time of 15 s per step. The diffraction data were evaluated with the software of Bruker-AXS and the qualitative X-ray phase analysis was performed with the software EVA v.7.0. The Rietveld method ( Rietveld, 1967) was used for quantitative phase determination using the software TOPAS 3.0. The Rietveld method enables quantitative evaluation of the structure-microstructure parameters and amount of mineralogical phases (wt.%) without addition of any standard.
. วัสดุและวิธีการThe dinosaur bones were collected during field work in 1999, 2000, and 2002 in Northern Qitai county, about 35 km north of Jiangjun Miao (“General's temple”) near the road Nr. 216, which leads from Qitai to the northern margin of the Junggar Basin (Fig. 1). The geographic positions referred to the WGS 84 are 44°48′45″N and 90°02′43″E at the southern slope of the Kelameili Mountain. In the center of the Kelameili Mountain a fault in WNW–ESE direction separates a long Paleozoic ophiolite belt in the NE from Mesozoic coal-bearing fluviatile and limnic sediments in the SW. During field work, more than 100 small bone fragments from unidentified dinosaurs were collected. Fourteen of these specimens were used for the preparation of 19 thin sections to investigate the taphonomic history and the bone histology. The bone fragments showed patchy black mineralizations in the capillary system of the bones as well as in the inter-trabecular space. Some fragments with these black mineralizations were powdered and several milligrams of bone powder were analysed with X-ray diffraction to identify the mineralogy of the bone and the diagenetic mineral infillings. The X-ray diffraction patterns were recorded using a Siemens X-ray diffractometer D5000 at the Steinmann-Institute of the University of Bonn with CuKα radiation (λ = 1.54178 Å). The X-ray generator worked at a power of 45 kV and 40 mA. The goniometer was equipped with a graphite secondary monochromator in the diffracted beam and the patterns were collected with 0.02° of step size. The powder patterns were collected in the angular range 4° to 70° in 2θ, with counting time of 15 s per step. The diffraction data were evaluated with the software of Bruker-AXS and the qualitative X-ray phase analysis was performed with the software EVA v.7.0. The Rietveld method ( Rietveld, 1967) was used for quantitative phase determination using the software TOPAS 3.0. The Rietveld method enables quantitative evaluation of the structure-microstructure parameters and amount of mineralogical phases (wt.%) without addition of any standard.
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