The 3-D crustal structure of P-wave velocity in East China is studied based on the data obtained by wide-angle seismic reflection and refraction surveys.The results suggest that a deep Moho disconti-nuity exists in th...The 3-D crustal structure of P-wave velocity in East China is studied based on the data obtained by wide-angle seismic reflection and refraction surveys.The results suggest that a deep Moho disconti-nuity exists in the western zone of the study region,being 35―48 thick.High-velocity structure zones exist in the upper crust shallower than 20 km beneath the Sulu and Dabie regions.The cause of high-velocity zones is attributable to high-pressure metamorphic(HPM) and ultra-high-pressure metamorphic(UHPM) terranes with high velocity and density exhuming up to the upper crust in the Sulu and Dabie orogenies.Anomalous zones of low velocity are in the lower crust,about 30 km beneath the Sulu and Dabie regions.The Moho discontinuity is as deep as 38 km beneath the Dabie region,deeper than those in the surrounding areas.The Moho discontinuity beneath the Sulu orogenic region is also a little deeper than those in its vicinity,being about 32 km.The deep Moho discontinuity zone implies that the low crustal velocity structure zone is in that region.The low-velocity characteristics in the lower crust are probably related to the remnant crustal root of the old mountains due to the orogeny in the Sulu and Dabie regions.The high-velocity anomalous zones in the upper crust and low-velocity anomalous zones in the lower crust beneath the Sulu region are all located northeast of the northern segment of the Tan-Lu fault.However,the high-and low-velocity anomalous zones beneath the Dabie region are located southwest of the southern segment of the Tan-Lu fault.Such a distribution of the velocity-anomalous zones looks to be attributable a left lateral slip motion along the Tan-Lu fault.The distribution pattern of the velocity-anomalous zones may show some evidence for the left strike-slip motion regime of the Tan-Lu fault.展开更多
报道了19个浙江植物分布新记录,其中短果芥属HirschfeldiaMoench,短果芥H.incana,盘珠鹿药Maianthemum robustum和白花印度黄芩Scutellaria indica f. leucantha属中国分布新记录;黑种豇豆Vigna stipulata,大花鬼针草Bidens alba var. r...报道了19个浙江植物分布新记录,其中短果芥属HirschfeldiaMoench,短果芥H.incana,盘珠鹿药Maianthemum robustum和白花印度黄芩Scutellaria indica f. leucantha属中国分布新记录;黑种豇豆Vigna stipulata,大花鬼针草Bidens alba var. radiata和光茎飞蓬Conyza canadensis var. pusillus属中国大陆分布新记录;狭叶黄檀Dalbergia stenophylla,头序歪头菜Vicia ohwiana,密花薹草Carex confertiflora和白花鸭跖草Commelina communis f.albiflora属华东分布新记录;山桑Morusmongolicavar.diabolica,福建小檗Berberisfujianensis,少花桂Cinnamomum pauciflorum,红花截叶铁扫帚Lespedeza lichiyuniae,绒毛锐尖山香圆Turpinia arguta var. pubescens,刺毛柳叶箬Isachne sylvestris,多叶韭Allium plurifoliatum和小斑叶兰Goodyera repens属浙江分布新记录。展开更多
基金Supported partly by National Natural Science Foundation of China (Grant No.40674026)National Special Science Foundation of China (Grant No.200811037)
文摘The 3-D crustal structure of P-wave velocity in East China is studied based on the data obtained by wide-angle seismic reflection and refraction surveys.The results suggest that a deep Moho disconti-nuity exists in the western zone of the study region,being 35―48 thick.High-velocity structure zones exist in the upper crust shallower than 20 km beneath the Sulu and Dabie regions.The cause of high-velocity zones is attributable to high-pressure metamorphic(HPM) and ultra-high-pressure metamorphic(UHPM) terranes with high velocity and density exhuming up to the upper crust in the Sulu and Dabie orogenies.Anomalous zones of low velocity are in the lower crust,about 30 km beneath the Sulu and Dabie regions.The Moho discontinuity is as deep as 38 km beneath the Dabie region,deeper than those in the surrounding areas.The Moho discontinuity beneath the Sulu orogenic region is also a little deeper than those in its vicinity,being about 32 km.The deep Moho discontinuity zone implies that the low crustal velocity structure zone is in that region.The low-velocity characteristics in the lower crust are probably related to the remnant crustal root of the old mountains due to the orogeny in the Sulu and Dabie regions.The high-velocity anomalous zones in the upper crust and low-velocity anomalous zones in the lower crust beneath the Sulu region are all located northeast of the northern segment of the Tan-Lu fault.However,the high-and low-velocity anomalous zones beneath the Dabie region are located southwest of the southern segment of the Tan-Lu fault.Such a distribution of the velocity-anomalous zones looks to be attributable a left lateral slip motion along the Tan-Lu fault.The distribution pattern of the velocity-anomalous zones may show some evidence for the left strike-slip motion regime of the Tan-Lu fault.
文摘报道了19个浙江植物分布新记录,其中短果芥属HirschfeldiaMoench,短果芥H.incana,盘珠鹿药Maianthemum robustum和白花印度黄芩Scutellaria indica f. leucantha属中国分布新记录;黑种豇豆Vigna stipulata,大花鬼针草Bidens alba var. radiata和光茎飞蓬Conyza canadensis var. pusillus属中国大陆分布新记录;狭叶黄檀Dalbergia stenophylla,头序歪头菜Vicia ohwiana,密花薹草Carex confertiflora和白花鸭跖草Commelina communis f.albiflora属华东分布新记录;山桑Morusmongolicavar.diabolica,福建小檗Berberisfujianensis,少花桂Cinnamomum pauciflorum,红花截叶铁扫帚Lespedeza lichiyuniae,绒毛锐尖山香圆Turpinia arguta var. pubescens,刺毛柳叶箬Isachne sylvestris,多叶韭Allium plurifoliatum和小斑叶兰Goodyera repens属浙江分布新记录。
