为准确展现矿山修复生态效益成果,设计基于DEA算法的矿山修复生态效益评估模型.依据矿山地理区域特征和其修复生态效益目的,利用层次分析法,建立矿山修复生态效益评估指标体系;根据获取的一级、二级和三级评估指标,利用DEA算法建立DEA评估模型,通过求解DEA评估模型内的C2R线性规划模型,对决策单元进行判定,当判定为无效时,利用投影定理在保证输出数值一定的情况下降低原来的输入,或在保证输入数值一定的情况下提升输出数值,从而完成矿山修复生态效益评估.实验结果表明:该模型对矿区的修复生态效益指标评估结果与专家评分结果相差不大,且与之相比更加精确,具有较高的评估有效性;评估均方根误差仅为2.78,评估准确性高;模型ROC曲线较为平滑,且灵敏度数值较高,评估稳定性卓越.

通过对天津蓟州区农村切坡建房引发的地质灾害特征进行调查分析,提出了有针对性的防治措施,为区域防灾减灾管理、灾后搬迁安置、建立群测群防体系提供科学依据.

工作区大地构造位置为华北准地台之燕山台褶带南缘,地形地貌复杂,地质构造复杂,岩土体工程地质性质一般,地质灾害较发育.本文从地质概况、工程地质条件、滑塌现状进行分析,对地质灾害危险性进行了评价,最后提出"退线15 m+顺产状削方减载(坡率1:2.5)+主动防护网+截排水沟"治理方案,为工程建设及防灾减灾提供参考.

在我国科学技术不断发展的影响下,社会生活与工业生产都对矿产资源的开采量提出了新的要求.在这样的社会背景下,矿产企业的生产经营活动面对着更多的挑战以及发展机遇.近年来,通过企业与地方政府的合作,我国在对矿山地质灾害的防范方面已经取得了很大的进步.同时随着勘查技术的不断创新,使得矿山环境不断恶劣的情况渐渐有了改善.本文就对矿山地质灾害的勘查方法进行分析,并为矿山地质的勘查提供一些防治灾害的措施.

Hexigten Qi is located to the north of Xar Moron River,tectonically on the south margin of Xilinhot massif.The authors conduct the analysis on the detrital zircon LA ICP MS U Pb dating for the metasiltstones of Linxi Formation from a ca.5 km outcrop in the northeastern Hexigten Qi.The samples yield 4 groups of ages principally at:258 298 Ma (peak at 285 Ma),377 474 Ma (peak at 430 Ma),1 261 1 727 Ma,and 1 853 2 513 Ma.Besides,two zircons yield the age of 321 Ma and 937 Ma respectively.Zirons aged 258 298 Ma show oscillatory zones in CL images,reflecting the magmatic events in Late Paleozoic along Xing’an Mongolia orogenic belt.Zircons with 377 474 Ma ages are featured by both magmatic and metamorphic origins,suggesting that the provenances of Linxi Formation in Hexigten Qi probably were from Ordovician-Devonian magmatic and Paleozoic metamorphic rocks. Zircons yielded ages of 1 261 1 727 Ma are dominated by magmatic zircons,with some metamorphic zircons;indicating that the Mesoproterozoic magmatic and metamorphic rocks are also the provenances of Linxi Formation.Most of the Zircons aged 1 853 2 513 Ma are of magmatic origin,showing the old age information from North China Craton (NCC).The youngest age from this metasiltstone is 258 Ma, which constrains the deposition age of Linxi Formation to Late Permian.The broad scope of ages reflects the tectono-magmatic events both in NCC and Xing’an Mongolia orogenic belt,and indicates that Linxi Formation has two provenances,and also implies that NCC and Siberia plate had amalgamated before Linxi Formation deposited.

A suit of volcanic rocks outcrop in Xi Ujimqin Qi and is considered to be the west extension of the well-known Dashizhai Formation whose tectonic setting remains controversial. To constrain the age of formation and tectonic nature of the volcanic rocks, petrology, geochronology and geochemistry researches were conducted. The results revealed that the volcanic rocks were mainly composed of andesites and rhyolites. LA-MC-ICP-MS zircon U-Pb dating yielded ages of 275?311 Ma. The andesites are rich in alkali but poor in MgO, slightly enriched in LREE, K, Rb, Ba but depleted in Nb and Ta, with slight negative Eu anomalies. Geochemical characteristics indicated the andesites were generated by fractional crystallization of synchronous basic magma, but contaminated by continental crust. The rhyolites are characterized by low CaO and MgO contents but with high SiO2, K2O and Na2O contents. Chondrite- normalized REE patterns of the rhyolites exhibit slight LREE enrichment, with striking negative Eu anomalies. The rhyolites are also enriched in LILE but strongly depleted in Nb, Ta, Sr, P, Ti, which suggests the acid magma was originated from partial melting of the mid-lower continental crust and underwent subsequent fractional crystallization. Geochemical plots of the andesites exhibit characteristics of within-plate basalt, while the rhyolites show an affinity with A2-type granites. Geochemical characteristics of the volcanic rocks in Xi Ujimqin Qi suggest a post-collisional setting. Combined with previous published regional geological data, we concluded that the Dashizhai Formation in Xi Ujimqin Qi was formed in a post-collisional extensional setting and the Paleo-Asian Ocean was closed no later than the late Permian.

The eastern segment of the Central Asian Orogenic Belt is traditionally called the Xing’an Mongolia Orogenic Belt (XMOB). Ordovician intrusive rocks exposed in the XMOB, from north to south, are the Abaga-East Ujimqin Qi-Duobaoshan belt, the Sonid Zuoqi-West Ujimqin Qi belt, and the Damaoqi-Baimaimiao-Tulinkai belt, respectively. Zircon U–Pb dating and geochemical data are presented for the intrusive rocks in East Ujimqin Qi and West Ujimqin Qi, Inner Mongolia. The intrusive rocks from East Ujimqin Qi consist of gabbro, diorite, and granodiorite. LA-MC-ICP-MS zircon U–Pb ages range 446 to 461 Ma. Geochemical data suggest that the gabbros and diorites from East Ujimqin are a tholeiitic series, both of arc-related and N-MORB (mid-ocean ridge basalt) signature, indicating a back-arc basin setting. The granodiorites have a shoshonitic series and arc-related signature. Rare earth element (REE) patterns and trace element characteristics suggest gabbros, diorites, and granodiorites are petrogenetically correlated. These intrusive rocks from East Ujimqin Qi have high light REE, Th, and U concentrations, suggesting the effect of middle–upper continental crustal contamination. Major oxides display positive or negative correlations, with increasing MgO or SiO2, indicating that fractional crystallization occurred during magma evolution. Geochemical data of diorite from West Ujimqin Qi indicate a tholeiitic series, arc-related signature. Zircon U–Pb dating yielded an age of 441.8 ± 1.5 Ma. Integrated with the regionally exposed Mid–Late Ordovician plutons and metasedimentary strata, we concluded that the northward subduction of the Palaeo-Asian Ocean (PAO) that occurred beneath the southern margin of the South Mongolian Micro-continent along the Sonid Zuoqi-Xilinhot gave rise to early Palaeozoic igneous rocks from the Abaga–East Ujimqin Qi–Duobaoshan and the Sonid Zuoqi–West Ujimqin Qi belts. Southward subduction beneath the North China Craton generated the Damaoqi–Baimaimiao–Tulinkai belt. The results support the bidirectional subduction model of the PAO in the early Palaeozoic.

我国的会计核算工作已逐渐发展成为以信息技术与计算机技术向结合的方式进行.本文就会计核算方法与信息化之间的联系进行分析,对会计核算的新方法进行了研究,从而推动会计工作的发展.

To determine the formation time and tectonic setting of rhyolites outcropped in Geerchulu,Xi Ujimqin Qi, chronology,petrology and geochemistry studies were conducted in this paper,aiming at providing new evidence to con-strain the closure time of Paleo-Asian Ocean.Zircons U-Pb dating yielded an age of 221 ±1,Ma.The rhyolites are featured by abundance in silica and alkalis and lacking of calcium and magnesium,with high Ga /Al ratio,A /CNK>1.The sam-ples showed no obvious fractionation between LREE and HREE,remarkable Eu negative anomalies,depletion of Sr,P and Ti,enrichment of Zr and A 2-type granite affinity.These features revealed that the rhylites were generated by the un-derplating of mantle-derived magmas and the consequent partial melting of the lower crust under an extensional tectonic setting,suggesting the study region was under post-orogenic extensional setting in the Triassic and the Paleo-Asian Ocean had closed before Triassic.Triassic magma activity started from the Early Triassic and lasted till the Late Triassic.

文章简要说明了地质矿样中伴生元素同时测定的必要性,阐述了ICP-AES法的测定原理和应用现状,论述了用ICP-AES同时测定地质矿样中的铅、锌、砷、银含量的方法,将其与标准样品的标准结果进行对比,从而得出ICP-AES光谱法同时测定地质矿样中伴生元素铅、锌、砷、银含量的方法操作方便,结果准确,具有实际应用价值.

A set of medium metamorphic clasolite exposing in the area,sandwiched by the Bainaimiao arc magmatic and Wenduermiao complex rock zones in the middle Inner Mongolia,is known as the Baiyinduxi Group.Analysis of zircon(detrital grains) by using LA-MC-ICP-MS,sampled from the quartzsand stone of the group indicates that the apparent age is dated by 206Pb/238U technique,ranging from 294 Ma to 518 Ma and coinciding with the zircon dating from the Paleozoic arc magmatite of the northern margin of the North China block.It is suggested that the Paleozoic arc magmatite might be a sediment-source of the Baiyinduxi Group.Protolith of the group is likely a set of forearc depositional sequence,forming throughout the process of both the subduction of the Paleo-Asian Ocean floor and the Paleozoic magmatism,and was undergone with deformation and metamorphism due to orogenesis.Furthermore,obvious characters of the zircon samples showing magma genesis indicate that the protolith would be weathered sediments of either contemporaneous or slightly early magmatites.In addition,the fact that the Baiyinduxi Group was intruded by the end-Permian granites suggests that the forming,deformation and metamorphism of the protolith should take place in the period from 294 Ma to 254 Ma.Therefore,a collision along the Solonker suture zone should occur in the Early and Middle Permian.

Working region of Inner Mongolia crossovers the boundary between North China Platform and Xingmeng Orogenic belt.Based on the geological mapping, field observation, petrologic and geochemical stuidies, LA-ICP-MS U-Pb zircon dating were carried out for two plutons in order to place constraints on the post orogenic tectonic evolution. Working region is mainly composed of granodiorite and granite with minor monzonitic granite distributed along the margin of the pluton. LA-ICP-MS U-Pb zircon analyses reveal that granodiorite were intruded at 253.9 +/- 3.7 Ma, granite were dated at 238 +/- 6Ma in working zone. Major and trace element compositions show that the granodiorite and granite in working region are of high Kalc-alkaline affinities. They are characterized by enrichment in LREE.In the primitive-mantle-normalized trace elements diagrams, all the granodiorite and granite show LILE and REE enriched patterns with variably trough at Nb, Sr, P, a distinctive feature of subduction-related magmas. In a few tectonic diagrams, most granitoids plot the field of within-plate granites, and some belong to the syn- and post-collision granites.post-collision granites sign the end of the post-collisional orogenic episode.