In recent years, a considerable amount of microscopic spherules have been found in concentrates recovered from some stratabound gold deposits occurring in Middle-Upper Triassic turbidite series in northwestern Sichuan...In recent years, a considerable amount of microscopic spherules have been found in concentrates recovered from some stratabound gold deposits occurring in Middle-Upper Triassic turbidite series in northwestern Sichuan. Study indicates that these spherules are cosmic dust. It is the first time that cosmic dust of extraterrestrial origin has been found in hydrothermal gold deposits in China.The spherules are steel-grey in colour and show metallic luster. Their grain size is commonly less than 100 μm. According to their composition, they belong to chromium-rich iron cosmic dust. The spherules have complex and diverse microscopic structures and textures, i.e. they show a very distinct Widmanstaten structure.The variation of cosmic dust content in gold deposits exhibits a positive correlation with the mineralization intensities and hydrothermal alteration. Such a relation indicates that the ore sub- stances may transport not only mechanically but also may chemically in hydrothermal solutions.展开更多
A great quartity of cosmic dust（spherules） was found in deep-sea sediments during May to July,1983manganese nodule investigations by the R/V“XIANGYANGHONG 16”in the area 7°-11°N,167°-178°Win th...A great quartity of cosmic dust（spherules） was found in deep-sea sediments during May to July,1983manganese nodule investigations by the R/V“XIANGYANGHONG 16”in the area 7°-11°N,167°-178°Win the Pacific.Comprehensive study of the cosmic dust and determination with Laser Raman MolecularMicroprobe（LRMM） of the molecules in it showed that besides Fe-Fe,Fe<sup>3+</sup>-O,Fe-Ni,Al-O,Fe-Obr-Si and Si-Onb,it also contained the organic molecules C-H-O and C-H-S-O,various no fixed form molecules of C,CH<sub>2</sub>,CH<sub>3</sub> and volatile molecules CO<sub>2</sub>,H<sub>2</sub>O,OH<sup>-</sup> and H<sub>2</sub>S,etc…The study result has very important applications for exploring the origin of interplanetary dust parti-cles and life material.展开更多
In the strdy of the source material of granites ,it is found that cosmic dust can be used as one of the indicators for identifying the genetic types of granites.It is suggested that granites can be grouped into two ge...In the strdy of the source material of granites ,it is found that cosmic dust can be used as one of the indicators for identifying the genetic types of granites.It is suggested that granites can be grouped into two genetic types, dust-barren granite and dust-containing granite, corresponding to I-type and S-type respectively as defined by Chappell et al.展开更多
A large number of cosmic dust particles, micrometeorites and volcanic dust bands have been found and collected in Antarctic ice, snow and glacial sediments, especially in meteorite concentrated regions. Extraterrestri...A large number of cosmic dust particles, micrometeorites and volcanic dust bands have been found and collected in Antarctic ice, snow and glacial sediments, especially in meteorite concentrated regions. Extraterrestrial spherules also have been discovered from the stratosphere and deep-sea sediments. On the basis of their distributive characteristics the cosmic dust particles are classified into interplanetary dust particles and interstellar dust particles. According to their origins cosmic dust particles can be divided into cometary origin particles, asteroidal origin particles, ablation particles from meteorites and interstellar origin particles. The criteria for identifying cosmic dust particles have been established and the origins of cosmic dust particles are also discussed in aegis paper.展开更多
When we investigated the occurring conditions of the iron-riih deposits in Jining-Erlian area, Nei Mongol, in 1977, many opaque and shiny steel balls about 200μ in diameter have been found in the strong magnetic frac...When we investigated the occurring conditions of the iron-riih deposits in Jining-Erlian area, Nei Mongol, in 1977, many opaque and shiny steel balls about 200μ in diameter have been found in the strong magnetic fraction of both natural and artifact heavy minerals from the Wenduermiao Group and Bainaimao Group. Examinations of different approaches led to the conclusion that they are the cosmic dusts.展开更多
We measured the annual deposit mass of cosmic dust on the Earth based on average sedimentation rate and content of cosmic dust at 20 surface stations on the Pacific investigation area (6°—13°N, 166°—1...We measured the annual deposit mass of cosmic dust on the Earth based on average sedimentation rate and content of cosmic dust at 20 surface stations on the Pacific investigation area (6°—13°N, 166°—178°W). The results indicate that measured results of each station are more identical and in accord with most measured results in the past, too.展开更多
Most cosmic dusts possess distinctive surfacial textures. The investigation on these textures greatly contributes to the research of ablation for meteorite and the geneses of cosmic dusts.
The Quaternary loess deposits in the arid-semiarid area in northwestern China are composed of eolian sedimemts which are continuous in terms of sedimentation and have undergone little alternation after deposition.They...The Quaternary loess deposits in the arid-semiarid area in northwestern China are composed of eolian sedimemts which are continuous in terms of sedimentation and have undergone little alternation after deposition.They provide an ideal place for the preservation of the extraterrestrial falls on the earth.The Late Pleistocene Malan loess is chosedn for our study of the preserved cosmic dusts.展开更多
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
The systematic study in this article has proved that the magnetic ferro-spherules in granite of various ages are cosmic dust which was discovered in the Yangjiazhangzi Molybdenum (Mo) field in the west of Liaoning Pro...The systematic study in this article has proved that the magnetic ferro-spherules in granite of various ages are cosmic dust which was discovered in the Yangjiazhangzi Molybdenum (Mo) field in the west of Liaoning Province (see the newspaper of 'Chinese Geology' for detailed information).展开更多
A large number of microspherules have been extracted from Suzhou A-type granite bymeans of heavy placer.Both natural surfaces and part sections of 539 microspherules have been observed bySEM.457 microspherules have be...A large number of microspherules have been extracted from Suzhou A-type granite bymeans of heavy placer.Both natural surfaces and part sections of 539 microspherules have been observed bySEM.457 microspherules have been determined by EDX,with some of them by EPMA,XRD and INAA.The results suggest these spherules are of ablated cosmic dust.Among them silicate glassy microspheruleshave been highly enriched in REE and other lithophile refractory trace elements,and REE abundance patternfavors a meteoritic origin as a roughly flat distribution.Ringwoodite has been first found in these glassy mi-crospherules.The composition of these iron spherules is similar to those of the ablated cosmic dust from deepsea and polar ice.Some Fe-Ni spherules and spherules composed of troilite have also been found.This isprobably the first report on various types of cosmic dust extracted from granite.展开更多
Ⅰ. GEOLOGICAL SETTINGS OF SAMPLING LOCALITY The sampling locality is in Changzhougou Village on the northern North China Platform. In the late Precambrian, this area seriously sank. Changzhougou Formation overlies un...Ⅰ. GEOLOGICAL SETTINGS OF SAMPLING LOCALITY The sampling locality is in Changzhougou Village on the northern North China Platform. In the late Precambrian, this area seriously sank. Changzhougou Formation overlies unconformably the Archaean gneiss.展开更多
The development of globally distributed Phanerozoic petroleum source rocks is concentrated on time intervals, which correlate convincingly with climatic driven glaciation epochs of Earth’s history, repeated every 150...The development of globally distributed Phanerozoic petroleum source rocks is concentrated on time intervals, which correlate convincingly with climatic driven glaciation epochs of Earth’s history, repeated every 150 million years, and during sea level high stands and maxima of global magmatism with a period of 300 million years. The 150 million year periodicity appears to be related to the path of the solar system through the spiral arms of the Milky Way and the 300 million year periodicity to changes of the spiral system. The spiral arms are preferred birth places of new stars, of which the larger ones have only smaller lifespans. Their preliminary deaths ended with explosions and selectively with the development of so-called white dwarfs, neutron stars or black holes. The times of the explosions of intermediate (sun-like) stars can be determined by measuring the present brightness of the dwarfs. Not surprisingly the last two maxima of recordable near solar system star explosions took place during the presumably spiral arms driven glacial epochs in Eocene to present and Upper Jurassic times. Such near solar system star explosions may have been the source of intense neutrino showers, cosmic rays and star dust. This dust contained all kinds of chemical elements, including phosphorus and uranium. Such cosmic phosphorus may have supported, through fertilizing, the distribution of life on Earth additionally to local phosphorus resources via bloom of biota in lakes and oceans and the enhanced growth of plants on land across all climatic zones. Subsequently it maintained the development of petroleum source rocks of all organic matter types within black shales and coals. Via the distribution of remnants of exploding stars—mainly white dwarfs, but neutron stars and black holes have to be counted as well—a cosmic contribution can therefore casually linked to the deposition of petroleum source rocks on Earth, not only purely correlatively by their contemporaneous appearances.展开更多
基金This study was supported by National Natural Science Foundation of China Grant 4880099
文摘In recent years, a considerable amount of microscopic spherules have been found in concentrates recovered from some stratabound gold deposits occurring in Middle-Upper Triassic turbidite series in northwestern Sichuan. Study indicates that these spherules are cosmic dust. It is the first time that cosmic dust of extraterrestrial origin has been found in hydrothermal gold deposits in China.The spherules are steel-grey in colour and show metallic luster. Their grain size is commonly less than 100 μm. According to their composition, they belong to chromium-rich iron cosmic dust. The spherules have complex and diverse microscopic structures and textures, i.e. they show a very distinct Widmanstaten structure.The variation of cosmic dust content in gold deposits exhibits a positive correlation with the mineralization intensities and hydrothermal alteration. Such a relation indicates that the ore sub- stances may transport not only mechanically but also may chemically in hydrothermal solutions.
基金The project supported by the National Natural Soence Foundation of China,No.4917263
文摘A great quartity of cosmic dust（spherules） was found in deep-sea sediments during May to July,1983manganese nodule investigations by the R/V“XIANGYANGHONG 16”in the area 7°-11°N,167°-178°Win the Pacific.Comprehensive study of the cosmic dust and determination with Laser Raman MolecularMicroprobe（LRMM） of the molecules in it showed that besides Fe-Fe,Fe<sup>3+</sup>-O,Fe-Ni,Al-O,Fe-Obr-Si and Si-Onb,it also contained the organic molecules C-H-O and C-H-S-O,various no fixed form molecules of C,CH<sub>2</sub>,CH<sub>3</sub> and volatile molecules CO<sub>2</sub>,H<sub>2</sub>O,OH<sup>-</sup> and H<sub>2</sub>S,etc…The study result has very important applications for exploring the origin of interplanetary dust parti-cles and life material.
文摘In the strdy of the source material of granites ,it is found that cosmic dust can be used as one of the indicators for identifying the genetic types of granites.It is suggested that granites can be grouped into two genetic types, dust-barren granite and dust-containing granite, corresponding to I-type and S-type respectively as defined by Chappell et al.
文摘A large number of cosmic dust particles, micrometeorites and volcanic dust bands have been found and collected in Antarctic ice, snow and glacial sediments, especially in meteorite concentrated regions. Extraterrestrial spherules also have been discovered from the stratosphere and deep-sea sediments. On the basis of their distributive characteristics the cosmic dust particles are classified into interplanetary dust particles and interstellar dust particles. According to their origins cosmic dust particles can be divided into cometary origin particles, asteroidal origin particles, ablation particles from meteorites and interstellar origin particles. The criteria for identifying cosmic dust particles have been established and the origins of cosmic dust particles are also discussed in aegis paper.
文摘When we investigated the occurring conditions of the iron-riih deposits in Jining-Erlian area, Nei Mongol, in 1977, many opaque and shiny steel balls about 200μ in diameter have been found in the strong magnetic fraction of both natural and artifact heavy minerals from the Wenduermiao Group and Bainaimao Group. Examinations of different approaches led to the conclusion that they are the cosmic dusts.
基金Project supported by the National Natural Science Foundation of China.
文摘We measured the annual deposit mass of cosmic dust on the Earth based on average sedimentation rate and content of cosmic dust at 20 surface stations on the Pacific investigation area (6°—13°N, 166°—178°W). The results indicate that measured results of each station are more identical and in accord with most measured results in the past, too.
基金Project supported by the National Natural Science Foundation of China.
文摘Most cosmic dusts possess distinctive surfacial textures. The investigation on these textures greatly contributes to the research of ablation for meteorite and the geneses of cosmic dusts.
基金Project supported by the Xi'an Lab of LoessQuaternary Geology.
文摘The Quaternary loess deposits in the arid-semiarid area in northwestern China are composed of eolian sedimemts which are continuous in terms of sedimentation and have undergone little alternation after deposition.They provide an ideal place for the preservation of the extraterrestrial falls on the earth.The Late Pleistocene Malan loess is chosedn for our study of the preserved cosmic dusts.
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.
文摘The systematic study in this article has proved that the magnetic ferro-spherules in granite of various ages are cosmic dust which was discovered in the Yangjiazhangzi Molybdenum (Mo) field in the west of Liaoning Province (see the newspaper of 'Chinese Geology' for detailed information).
基金the National Natural Science Foundation of China
文摘A large number of microspherules have been extracted from Suzhou A-type granite bymeans of heavy placer.Both natural surfaces and part sections of 539 microspherules have been observed bySEM.457 microspherules have been determined by EDX,with some of them by EPMA,XRD and INAA.The results suggest these spherules are of ablated cosmic dust.Among them silicate glassy microspheruleshave been highly enriched in REE and other lithophile refractory trace elements,and REE abundance patternfavors a meteoritic origin as a roughly flat distribution.Ringwoodite has been first found in these glassy mi-crospherules.The composition of these iron spherules is similar to those of the ablated cosmic dust from deepsea and polar ice.Some Fe-Ni spherules and spherules composed of troilite have also been found.This isprobably the first report on various types of cosmic dust extracted from granite.
基金Project supported by the National Natural Science Foundation of China
文摘Ⅰ. GEOLOGICAL SETTINGS OF SAMPLING LOCALITY The sampling locality is in Changzhougou Village on the northern North China Platform. In the late Precambrian, this area seriously sank. Changzhougou Formation overlies unconformably the Archaean gneiss.
文摘The development of globally distributed Phanerozoic petroleum source rocks is concentrated on time intervals, which correlate convincingly with climatic driven glaciation epochs of Earth’s history, repeated every 150 million years, and during sea level high stands and maxima of global magmatism with a period of 300 million years. The 150 million year periodicity appears to be related to the path of the solar system through the spiral arms of the Milky Way and the 300 million year periodicity to changes of the spiral system. The spiral arms are preferred birth places of new stars, of which the larger ones have only smaller lifespans. Their preliminary deaths ended with explosions and selectively with the development of so-called white dwarfs, neutron stars or black holes. The times of the explosions of intermediate (sun-like) stars can be determined by measuring the present brightness of the dwarfs. Not surprisingly the last two maxima of recordable near solar system star explosions took place during the presumably spiral arms driven glacial epochs in Eocene to present and Upper Jurassic times. Such near solar system star explosions may have been the source of intense neutrino showers, cosmic rays and star dust. This dust contained all kinds of chemical elements, including phosphorus and uranium. Such cosmic phosphorus may have supported, through fertilizing, the distribution of life on Earth additionally to local phosphorus resources via bloom of biota in lakes and oceans and the enhanced growth of plants on land across all climatic zones. Subsequently it maintained the development of petroleum source rocks of all organic matter types within black shales and coals. Via the distribution of remnants of exploding stars—mainly white dwarfs, but neutron stars and black holes have to be counted as well—a cosmic contribution can therefore casually linked to the deposition of petroleum source rocks on Earth, not only purely correlatively by their contemporaneous appearances.
