Since the discovery of cosmic dust from Suzhou A-type granite, a following new problem is whether cosmic dust is preserved in only one type granite or in different types. In order to make the problem clear, the author...Since the discovery of cosmic dust from Suzhou A-type granite, a following new problem is whether cosmic dust is preserved in only one type granite or in different types. In order to make the problem clear, the authors carried out many field and room investigations on I-type granite of western Suzhou, and found out that Suzhou I-type granite also could retain microspherules. Studies about these microspherules indicate that they are of ablated cosmic dust.展开更多
Several of the known over 3000 minerals possess great typomorphic implication and experienced twists and turns of their discovery. Ringwoodite is the most outstanding of them. In 1931, Goldshmidt suggested that the cr...Several of the known over 3000 minerals possess great typomorphic implication and experienced twists and turns of their discovery. Ringwoodite is the most outstanding of them. In 1931, Goldshmidt suggested that the crystal structure of Mg<sub>2</sub>GeO<sub>4</sub> could show two polymorphs for olivine and spinel. Based on this, in 1936, J. D. Bernal put forward his bold assumption that the increase of seismic velocity in mantle is caused by展开更多
基金the National Natural Science Foundation of Chinathe Analytical Foundation of Center for Modern Analysis, Nanjing University.
文摘Since the discovery of cosmic dust from Suzhou A-type granite, a following new problem is whether cosmic dust is preserved in only one type granite or in different types. In order to make the problem clear, the authors carried out many field and room investigations on I-type granite of western Suzhou, and found out that Suzhou I-type granite also could retain microspherules. Studies about these microspherules indicate that they are of ablated cosmic dust.
基金Project supported by the National Natural Science Foundation of China
文摘Several of the known over 3000 minerals possess great typomorphic implication and experienced twists and turns of their discovery. Ringwoodite is the most outstanding of them. In 1931, Goldshmidt suggested that the crystal structure of Mg<sub>2</sub>GeO<sub>4</sub> could show two polymorphs for olivine and spinel. Based on this, in 1936, J. D. Bernal put forward his bold assumption that the increase of seismic velocity in mantle is caused by
