Abstract: It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the...Abstract: It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the Devonian, include the Palaeoproterozoic. The super-large Changba-Lijiagou Pb-Zn deposit occurs in the Palaeoproterozoic strata. The deposits in this district are not hydrothermal-sedimentary deposits or their reworked ones, but Yanshanian-Himalayan epigenetic hydrothermal deposits. The modes of occurrence, sizes and positions of all the deposits in the Xicheng orefield are completely controlled by the choula (draw)-thrust sheet. Therefore the previous grounds for the model of the Qinling-type Pb-Zn deposits cannot hold good. The authors propose that the Changba-type and Bijiashan-type Pb-Zn deposits be used to represent two mineral deposit models with different characteristics in the Xicheng orefield.展开更多
For those businesses that now choose to participate in Xicheng's new insurance system,the manage-ment of health-care expenses has to be readjusted accordingly.The Xicheng District Labor Bureau has suggested that e...For those businesses that now choose to participate in Xicheng's new insurance system,the manage-ment of health-care expenses has to be readjusted accordingly.The Xicheng District Labor Bureau has suggested that each enterprise should set aside a special medical insurance fund for its employees.Businesses should also retain money for certain"adjustments,"to bridge the gap between major expenditures and health-care subsidies for indivi-dual workers.The new social medi-cal insurance system stresses that"minor ailments will be paid for by the company,and major ilnesses will rely on the unified fund."This is probably the wisest way in China to provide a reliable guarantee to workers of adequate health care.展开更多
基金This study was supported by the National Natural Science Foundation of China grant 49272136, the State Science and Technology Commission Project 96-914-01-04 and the Ministry of Geology and Mineral Resources Shaanxi-Gansu-Sichuan Project 95-02-002-01.
文摘Abstract: It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the Devonian, include the Palaeoproterozoic. The super-large Changba-Lijiagou Pb-Zn deposit occurs in the Palaeoproterozoic strata. The deposits in this district are not hydrothermal-sedimentary deposits or their reworked ones, but Yanshanian-Himalayan epigenetic hydrothermal deposits. The modes of occurrence, sizes and positions of all the deposits in the Xicheng orefield are completely controlled by the choula (draw)-thrust sheet. Therefore the previous grounds for the model of the Qinling-type Pb-Zn deposits cannot hold good. The authors propose that the Changba-type and Bijiashan-type Pb-Zn deposits be used to represent two mineral deposit models with different characteristics in the Xicheng orefield.
文摘For those businesses that now choose to participate in Xicheng's new insurance system,the manage-ment of health-care expenses has to be readjusted accordingly.The Xicheng District Labor Bureau has suggested that each enterprise should set aside a special medical insurance fund for its employees.Businesses should also retain money for certain"adjustments,"to bridge the gap between major expenditures and health-care subsidies for indivi-dual workers.The new social medi-cal insurance system stresses that"minor ailments will be paid for by the company,and major ilnesses will rely on the unified fund."This is probably the wisest way in China to provide a reliable guarantee to workers of adequate health care.
