The Shizitou molybdenum （Mo） deposit in Yongping, Jiangxi, is an important, recently discovered deposit in the eastern section of the Qin-Hang metallogenic belt. The Mo deposit is located in the outer contact zone b...The Shizitou molybdenum （Mo） deposit in Yongping, Jiangxi, is an important, recently discovered deposit in the eastern section of the Qin-Hang metallogenic belt. The Mo deposit is located in the outer contact zone behveen the porphyritic biotite granite and the Neoproterozoic migmatite, and present in the deep central part of the intrusion. Re-Os dating and S and Pb isotopic analysis have been conducted to assess the metallogenesis of the Shizitou Mo deposit. S, Pb and Re isotopes show that the ore-forming materials were derived from the porphyritic biotite granitic magma, which originated from the mixing of mantle and crust. Re-Os dating of molybdenite from the ores gives a model age from 156.9±2.2 to 158.5±2.4 Ma, with a weighted mean age of 158±1 Ma and an isochron age of 158.0±2.5 Ma. Geological and geochemical characteristics of the ore deposit and the related granitoids indicate that the Shizitou deposit is a Climax-type Mo deposit. Based on previous studies of the Qin-Hang metaliogenic belt, two metallogenic events are believed to have occurred during 172-145 Ma and 137-132 Ma. These two metallogenic periods are consistent with the timing of two metallogenic peaks during the middle to late Jurassic and the Cretaceous in South China. These events represent responses to the partial backarc extension associated with the subduction of the Izanagi plate beneath the Eurasian continent and the rapid northeastward movement of the subducting Izanagi plate.展开更多
BACKGROUND Intraabdominal adhesions develop spontaneously or after an inflammatory process or surgical procedure in the abdomen.They are the most common cause of small bowel obstruction(SBO).SBO occasionally leads to ...BACKGROUND Intraabdominal adhesions develop spontaneously or after an inflammatory process or surgical procedure in the abdomen.They are the most common cause of small bowel obstruction(SBO).SBO occasionally leads to intestinal ischemia(In Is)which can be a life-threatening condition that requires management as soon as possible.We herein report a case of SBO with In Is presented in our institution and treated without intestinal resection.CASE SUMMARY A 34-year-old man presented at the emergency department after a 12-h-onset diffuse abdominal pain,bloating and nausea.He had a history of traumatic right hepatectomy 11 years ago as well as adhesiolysis and resection of a long part of small bowel 2 years ago.An abdominal computed tomography(CT)showed dilated loops that led to the diagnosis of SBO.Due to deteriorating lactic acidosis,the patient was operated.Torsion of the small bowel around an adhesion led to2.30 m of ischemic ileum.After the application of N/S 40°C for 20 min,the intestine showed signs of improvement and it was decided to avoid resection and instead temporary close the abdomen with vacuum-pack technique.At the second-look laparotomy 48 h later,the intestine appeared normal.The patient was discharged on the 8 th post-op day in excellent condition.CONCLUSION In case of SBO caused by adhesions,extreme caution is needed if In Is is present,as the clinical signs are mild and you should rely for diagnosis in CT findings and lactate levels.Conservative surgical approach could reverse the effects of In Is,if performed quickly,so that intestinal resection is avoided and should be used even when minimum signs of viability are present.展开更多
基金supported by the Innovation–driven Plan of Central South University(Project 1053320180985)the National Natural Science Foundation of China(Grant No.41702078)
文摘The Shizitou molybdenum （Mo） deposit in Yongping, Jiangxi, is an important, recently discovered deposit in the eastern section of the Qin-Hang metallogenic belt. The Mo deposit is located in the outer contact zone behveen the porphyritic biotite granite and the Neoproterozoic migmatite, and present in the deep central part of the intrusion. Re-Os dating and S and Pb isotopic analysis have been conducted to assess the metallogenesis of the Shizitou Mo deposit. S, Pb and Re isotopes show that the ore-forming materials were derived from the porphyritic biotite granitic magma, which originated from the mixing of mantle and crust. Re-Os dating of molybdenite from the ores gives a model age from 156.9±2.2 to 158.5±2.4 Ma, with a weighted mean age of 158±1 Ma and an isochron age of 158.0±2.5 Ma. Geological and geochemical characteristics of the ore deposit and the related granitoids indicate that the Shizitou deposit is a Climax-type Mo deposit. Based on previous studies of the Qin-Hang metaliogenic belt, two metallogenic events are believed to have occurred during 172-145 Ma and 137-132 Ma. These two metallogenic periods are consistent with the timing of two metallogenic peaks during the middle to late Jurassic and the Cretaceous in South China. These events represent responses to the partial backarc extension associated with the subduction of the Izanagi plate beneath the Eurasian continent and the rapid northeastward movement of the subducting Izanagi plate.
文摘BACKGROUND Intraabdominal adhesions develop spontaneously or after an inflammatory process or surgical procedure in the abdomen.They are the most common cause of small bowel obstruction(SBO).SBO occasionally leads to intestinal ischemia(In Is)which can be a life-threatening condition that requires management as soon as possible.We herein report a case of SBO with In Is presented in our institution and treated without intestinal resection.CASE SUMMARY A 34-year-old man presented at the emergency department after a 12-h-onset diffuse abdominal pain,bloating and nausea.He had a history of traumatic right hepatectomy 11 years ago as well as adhesiolysis and resection of a long part of small bowel 2 years ago.An abdominal computed tomography(CT)showed dilated loops that led to the diagnosis of SBO.Due to deteriorating lactic acidosis,the patient was operated.Torsion of the small bowel around an adhesion led to2.30 m of ischemic ileum.After the application of N/S 40°C for 20 min,the intestine showed signs of improvement and it was decided to avoid resection and instead temporary close the abdomen with vacuum-pack technique.At the second-look laparotomy 48 h later,the intestine appeared normal.The patient was discharged on the 8 th post-op day in excellent condition.CONCLUSION In case of SBO caused by adhesions,extreme caution is needed if In Is is present,as the clinical signs are mild and you should rely for diagnosis in CT findings and lactate levels.Conservative surgical approach could reverse the effects of In Is,if performed quickly,so that intestinal resection is avoided and should be used even when minimum signs of viability are present.
