昌乐都北东周墓地出土的鼎、敦、舟等铜容器,文化属性鲜明,时代集中于春秋晚期至战国早期.都北M33等春秋晚期墓出土的陶鼎、敦是齐地较早的仿铜陶礼器.都北墓地青铜容器均为含Sn 10％-12％的铅锡青铜,M34及M60青铜器的铅料与同期中原及鲁中南地区一致.M33鼎泥芯中的CaO含量较低,可见较多植物来源的碎屑,显示春秋时期海岱北部与江淮、吴越等东南沿海地区的制范技术存在关联.这些综合研究有助于全面认识东周齐地青铜器的组合、材质与资源特征.

One geomagnetic pole and two virtual geomagnetic poles (VGPs) are now available from U-Pb dated dyke swarms/ individual dykes from the Eastern Block, Central Zone and Western Block of the North China craton. The precise baddeleyite U-Pb age of Hengshan GU dyke in the Central Zone is 1769±3Ma and is part of the Taihang dyke swarm. This swarm has yielded a paleomagnetic pole position at Plat =36°N, Plong = 247°E(dp = 2°, dm =4°). A dyke at location DY in the Eastern Block of the North China craton yields a baddeleyite U-Pb age of a baddeleyite 1620.8±6.9Ma, and a VGP at Plat =6.9°N, Plong = 81.9°E {dp = 4.31°,dm=6.09°). A nearby dyke at site LW4 gives a zircon SHRIMP U-Pb age of 1157±18Ma, and a VGP at Plat =27.1°N, Plong = 162°E( dp = 15.8°, dm = 18.7°). Although secular variation has not been removed from the Shandong data, comparison of these three paleomagnetic pole positions of the North China craton with the Mesoproterozoic APWP of the Canadian Shield allows a continental reconstruction whereby the North China craton joined the supercontinent Columbia with the Canadian Shield from 1800 to 1600Ma, and the North China craton separated from the Canadian Shield sometime between 1600 to 1200Ma in response to the final break-up of the supercontinent Columbia.

Granitoids in the late stage of the Mesoproterozoic along the north margin of the North China plate, are composed of biotite granites, tonalites, granodiorites and monzonitic granites. They exhibit the features of peraluminous granites, A/CNK1.1, and are characterized by higher SiO2, K2O and low FeO, MgO, CaO, TiO2, also higher Rb, K, Ta, Nd, Hf and low Nb, Sr, P, Ti in trace and minor elements. They have strong differentiation between LREE and HREE (La/Yb)N=6.61-54.63). REE patterns have middle negative Eu anomalies. The granitoid belt is approximately EW-trenging and parallel to Mesoproterozoic island arc belt of Bainaimiao group and Weijiagou rock group and ophiolite melanges belt of Kaiyuan rock group. The new geochemical data suggest that the Mesoproterozoic granitoids in middle segment of north margin of the North China Plate belong to syn-collisional S-type granitoids.They were produced during processes of subduction and collision between the North China Plate and Xiberia Plate in the late stage of Mesoproterozoic. This collisional event in the North China Plate may provide an essential constraint to the aggregation between the plate and others of supercontinental Rodinia.

The Bei′erkuduke tin deposit in the eastern Junggar area occurred in Late Carboniferous granitoids.It is a tin deposit of quartz-vein and greisen types.K-Ar dating of mica from the tin-bearing quartz-vein yields an age of 296.3 Ma±2.6 Ma,representing the metallogenic time and suggesting the metallogenesis coeval with the continental collision.The K-Ar age for mica from greisen is 177.9 Ma±2.6 Ma,obviously late than the metallogenic time,reflecting a post-ore tectono-thermal disturbance event.

Noble gas abundances and isotopic compositions in mantle-derived xenoliths were analyzed by crushing method, which from Keluo, Wudalianchi, Heilongjiang Province, Kuandian of Liaoning Province, Northeastern China. These results indicate the heterogeneity of subcontinental lithospheric mantle beneath northeastern China. 3 He/4 He ratios in the samples from Wudalianchi vary between 4.5 - 5.3RA, obviously lower than that of the MORB, with the signature of metasomated mantle. And their 40 Ar/36 Ar ratios change from 557 to 4005. Comparing the characteristics of noble gases with evidences from published Sr-Nd-Pb isotope data and alkali basalt petrology, it was estimated that there was a palaeo-subduction event took place in Wudalianchi area, and the upper mantle was metasomated by subducted crustic components or H2 O - CO2-rich fluid which derived from subducted slab, and coursed forming phlogopite-bearing Iherzolite. On the other hand, the samples from Kuandian show a depleted MORB-like 3 He/4 He ratio (7.30 - 7.52RA,), with 40 Ar/36 Ar ratio of 1496 - 7677. It implies that there are at least two type mantles beneath Northeastern China, the one is a metasomated subcontinental lithospheric mantle, and the other is a MORB reservoir-like mantle. They reflect different mantle evolution processes.

Noble gas abundances and isotopic compositions in mantle-derived xenoliths were analyzed by crushing method,which from Keluo,Wudalianchi,Heilongjiang Province,Kuandian of Liaoning Province,Northeastern China.These results indicate the heterogeneity of subcontinental lithospheric mantle beneath northeastern China.~3He/~4He ratios in the samples from Wudalianchi vary between 4.5～5.3R_A,obviously lower than that of the MORB,with the signature of metasomated mantle.And their ~(40)Ar/~(36)Ar ratios change from 557 to 4005.Comparing the characteristics of noble gases with evidences from published Sr-Nd-Pb isotope data and alkali basalt petrology,it was estimated that there was a palaeo-subduction event took place in Wudalianchi area,and the upper mantle was metasomated by subducted crustic components or H_2O-CO_2-rich fluid which derived from subducted slab,and coursed forming phlogopite-bearing lherzolite.On the other hand,the samples from Kuandian show a depleted MORB-like ~3He/~4He ratio (7.30～ 7.52R_A),with ~(40)Ar/~(36)Ar ratio of 1496～7677.It implies that there are at least two type mantles beneath Northeastern China,the one is a metasomated subcontinental lithospheric mantle,and the other is a MORB reservoir-like mantle.They reflect different mantle evolution processes.

δ13 Ccarb positive excursion event between 2.33 Ga∼2.06 Ga has been identified as a global event, which confirms the view that an environmental catastrophe in earth's surficial system occurred at about 2.3 Ga. To probe the cause of this global event, scientists have proposed several possibilities such as " snowball earth", super-mantle plume and/or supercontinent breakup, and extraterrestrial impact. Clearly, these hypotheses should be verified by more data in future studies. Therefore, we consider that δ13Ccarb positive excursion phenomenon will be found in more regions, changes in other aspects around 2.3 Ga boundary will be revealed, and new indicators will be used to trace the 2.3 Ga event.

K-Ar和Ar-Ar法是中、新生代火山岩最有效的测年方法之一,合适的粒度和有效的预处理程序对于提高年龄资料的质量至关重要.样品粒度选用60～80目粒级(0.28～0.18mm)既能保证样品的均匀性,又可以有效去除大气氩的污染.新鲜火山岩需要用稀硝酸浸泡,以去除可能的碳酸盐的影响;轻微蚀变的火山岩则须用6%氢氟酸浸泡5min,对年龄值的矫正可达20%.用电磁选的方法可以在很大程度上剔除捕虏晶的影响,对年龄值的矫正可达5%～10%.

介绍了K-Ar和Ar-Ar法定年样品的送样要求及实验室预处理程序,样品粒度以250～180 μm为宜;用量则视样品的K含量和年龄情况而定,K含量越高、年龄越老,所需样品量越少,多数样品的用量在几十至几百毫克;对于年龄情况不清楚的样品,10～20 g手标本或者1～2 g合适粒度的样品可以保证用量.全岩样品常受蚀变和捕虏晶的影响,有效的预处理可以在很大程度上消除这些干扰因素.文章还介绍了用稀HNO3消除碳酸盐、1.7 mol/L HF消除轻微蚀变的影响以及电磁选剔除捕虏晶的实验过程.

Precise measurement of Argon is considered to be one of the most important geoch ronological subjects in K-Ar dating of young volcanic materials. Based on the p resumption that ? 40Ar/? 36Ar ratio is equal to 295 5 during conven tional K-Ar dating, it has been studied that dating was constrained in some cas es, especially for young samples. A technique of unspiked Argon measurement has been improved and applied in recent years. The merits for this method are that argon will not be contaminated by spike ? 38Ar systematic ally, thus, the contents of ? 40Ar、 ? 38Ar and ? 36Ar will be measured by calibra ting with standard atmosphere. Considering the interference of mass fractionatio n of argon in volcanic rocks, it is allowed to calibrate ? 40Ar/? 36A r ratio with ? 38Ar/? 36Ar ratio of th e sample. Therefore, radiogen ic ? 40Ar * and age of sample will be calculated accurat ely. At present , unspiked K-Ar dating has been widely used in geological researches. It is abl e to acquire reliable ages including late Tertiary and Quaternary to interpret t he geological events and reconstruct the magmatic history. It implies that, for K-Ar chronology, a powerful means and approach will be used to study volcanic r ock younger than late Tertiary by introducing the principle and geological appli cation of unspiked K-Ar dating.

对马里亚纳海槽弧后扩张脊上所采集的玄武岩样品进行了系统的K-Ar定年,同时结合研究玄武岩的微量元素以及稀土元素特征后指出,马里亚纳海槽的张开及与之伴随发生的玄武岩浆活动自晚中新世以来一直都在进行,其主活动期为2～4Ma.海槽玄武岩年龄在空间上具有从南到北逐渐变新的演化规律.据此,推断该海槽的扩张演化可能受控于该区内热区的迁移及运动规律.

To develop and perfect the theory of plate tectonics and regional metallogeny, metal-logenesis during collisional orogenesis should be thoroughly studied and will attract increasing at-tention of more and more scientists. This paper presents the main aspects of research and discus-sions on metallogenesis during collisional orogenesis after the development of plate tectonics, and accordingly divides the study history into two stages, i.e. the junior stage during 1971-1990 and the senior stage after 1990. Beginning with the negation of mineralization in the collision regime by Guild (1971), the focus of study was put on whether there occurred any mineralization during collisional orogenesis at the junior stage. At the senior stage, which is initiated by the advance of met-allogenic and petrogenic model for collisional orogenesis, scientists begin to pay their attention to the geodynamic mechanism of metallogenesis, spatial and temporal distribution of ore deposits, ore-forming fluidization, relationship b

碰撞造山成矿作用研究是发展与完善板块构造理论和区域矿床学的必须,必然日益受到注意.列举了板块理论兴起以来与该问题有关的主要研究和讨论,将碰撞造山成矿作用研究历史划分为2个阶段,即1971～1990年间的初级研究阶段,1990年以后的高级研究阶段.初级研究阶段以Guild(1971)提出碰撞过程不可能发生成矿作用为开始,主要是讨论碰撞造山过程中是否有成矿作用发生;高级阶段则以提出碰撞造山成岩成矿模式为标志,开始研究碰撞造山成矿动力学、矿床时空分布规律、成矿流体作用、成矿与成岩的关系等问题.中国具备无比优越的开展碰撞造山成矿作用研究的自然条件,已经获得了重要研究进展和积累,因此呼吁职能部门和学者重视碰撞造山成矿作用的研究,并提出了可望在近期取得突破的若干研究问题.

Five Late-Cenozoic olivine basalt samples, taken from 3 young volcanoes (Keluo, Lianhuashan and Qinglongshan) located in the north of Heilongjian Province, were dated by the conventional K-Ar dating method. The apparent ages of whole rock are (0. 06 ±0. 01) Ma, (0.15 ±0.03) Ma, (0.17 ±0.02) Ma, (21.10 ±0.13) Ma and (24.46 ±0.10) Ma, respectively. In the crushed sample grains (mush number 80–100) olivine (including phynocryst and xenocryst)was picked out under a binocular microscope, then apparent ages obtained are (0.03 ±0.01) Ma, (0.06 ±0.01) Ma, (0.07 ±0.03) Ma, (2.31 ±0.02) Ma and (1.50 ±0.21) Ma, respectively. The apparent ages of the o-livine-picked out sample are come down (younger) 50% to over 90%. There are a lot of the Late-Cenozoic volcanic olivine basalt outcropping in eastern China, probably the age-datings of those basalt samples in which olivine grains are unpicked out are older than the true geological ages. The inference and conclusion drawn from those datings should be renewed.

马里亚纳海槽玄武岩的研究始于70年代早期.在过去的20年中,随着深海钻探计划（deep sea drillng project）的实施,研究工作日益深入.马里亚纳海槽玄武岩的研究成果,自80年代到90年代初相继出版了一批文章.1988年7—8月和1990年7—8月,中国-德国合作“太阳（SONEE）”号的第57和第69航次到马里亚纳海槽考察采样.本文的样品就是第