Luminescence chronology of loess-palaeosol deposits in the Central Shandong Mountains region: Provenances and paleoclimate implications

The loess-palaeosol deposits of the Central Shandong Mountains (CSM) to the east of the Chinese Loess Plateau (CLP) potentially provide valuable archives for the reconstruction of East Asian monsoon patterns. However, compared to the abundant attention given to the loess layer, fewer studies have explored the palaeosols documenting the processes and characteristics of interglacial climate changes. The high-resolution chronologies and provenances of the palaeosol in the CSM area are still unclear. In this work, the luminescence ages and paleoclimate proxies in the Shaozhuang (SZ) and Focun (FC) sections were studied, by combining detrital zircons U–Pb ages from the loess-palaesosol in Jingbian, Licheng, Focun, Pianguan and Dongming Yellow River sediments. Quartz single-aliquot regenerative dose protocol (SAR) and K-feldspar post-infrared IRSL (pIRIR₂₉₀) dating results were obtained in the SZ (8.0 ± 1.1 ka −50.8 ± 2.7 ka) and FC (3.8 ± 0.3 ka—144.0 ± 7.8 ka) sections to develop the most detailed CSM region chronologies to date. The analyzed grain sizes and detrital zircon U–Pb ages suggest that the provenance of the CSM loess was dominated by local Yellow River sediments. The palaeosols observed in the field in these two sections were composed of both aggradation soils deposited in the interglacial period and non-aggradation soil formed by the weathering and leaching of the underlying loess. We found evidences for the presence of non-aggradation soils as indicated the relatively high 5–16 μm particle percentages, relatively low chemical index of alteration (CIA) values and the percentages of >63 μm particles compared to those of the overlying palaeosol layers. Nevertheless, the loess-palaeosol deposits in the CSM are still the product of the East Asian monsoon and global climatic variations, as the deposits have recorded the glacial-interglacial cycles.     

黄山东镁铁超镁铁杂岩中的辉石化学成分研究

通过对黄山东镁铁超镁铁杂岩的辉石化学成分研究，证明辉石的化学成分受寄主岩石类型的制约，从超镁铁岩相到角闪辉长岩相斜方辉石的化学成分由富ＭｇＯ、ＳｉＯ＿２、Ａｌ＿２Ｏ＿３、Ｃｒ＿２Ｏ＿３到富ＦｅＯ、ＴｉＯ＿２、ＣａＯ、ＭｎＯ；单斜辉石化学成分由富Ａｌ＿２Ｏ＿３、Ｃｒ＿２Ｏ＿３、Ｎａ＿２Ｏ、ＭｇＯ到富ＦｅＯ、ＭｎＯ、ＣｏＯ。在同一寄主岩石中，单斜辉石比斜方辉石富ＴｉＯ＿２、Ａｌ＿２Ｏ＿３、Ｃｒ＿２Ｏ＿３、ＣａＯ和Ｎａ＿２Ｏ，贫ＭｇＯ、ＳｉＯ＿２、ＭｎＯ和ＦｅＯ。根据辉石化学成分特征得出黄山东杂岩形成于岛弧环境，为上地幔石榴二辉檄榄岩部分熔融形成的拉斑玄武岩岩浆结晶分异作用的产物。     

利用X射线衍射测定单斜辉石中硬玉组分含量

硬玉是单斜辉石中十分重要的端元组分,是单斜辉石分类的主要基础。利用x射线衍射分析确定的硬玉组分含量计算式为Jd(％)=[A-2.235]×25.741,其中Jd为硬玉组分百分含量,A为2—Theta角为30°(d=2.97)时峰值的相对强度Ⅰ与半高宽的乘积,其计算误差仅6.32％。     

山东蒙阴金刚石的晶体形态和晶面特征

为探讨山东蒙阴金刚石的形成条件,研究了胜利Ⅰ号金伯利岩筒的金刚石晶面及晶形特征,结果认为金刚石的形成温度范围为１０００～１６００℃,压力范围为４０×１０８Ｐａ～５０×１０８Ｐａ。     

山东半岛水资源开发和利用中的环境效应研究

山东半岛不仅是我国经济发展和对外开放的重要地区 ,也是我国水资源短缺比较严重的地区。分析山东半岛的水资源的现状 ,研究水资源开发利用中的环境效应 ,并提出山东半岛水资源可持续利用的 7点策略。     

山东及其近海区地震序列类型地理分布特征

依据山东及其近海历史地震资料记载，初步确定了本区主要中、强地震的序列类型，结合现代地震序列资料，对研究区地震序列类型的地理分布进行了分析，给出了不同序列类型分区，并对其地质构造环境作了简单分析，这时本区大震现场工作中的震后趋势判断有实用意义。     

根据历史地震和应变能积累释放过程分析山东地区近期地震活动趋势

根据历史地震和应变能积累释放过程对山东地区地震活动特征进行分析,认为该区目前处于地震活跃时段后期的能量剩余释放阶段,在此期间将以中等或中强地震活动为主。由现代地震活动特点分析认为,该区目前处于最近的一个应变能积累—释放过程中的释放阶段,这一阶段还可能持续4年左右,在此释放阶段中有可能发生多次4～5级乃至6级地震,但发生6级以上地震的可能性不大。     

高密度电阻率法(RT)在金矿深部成矿预测中的应用

高密度电阻率法（RT）通常只能在地表应用，在特定条件下，在金矿井下深部首次应用该方法，查明赋矿构造向深部的延伸情况，并对在井下深部应用该方法的条件做了描述总结，结合前期地质工作的成果对实测结果做了可靠性探讨，拓展了高密度电阻率法（RT）的应用领域。     

致灾营力当量预报预警方法探讨--以山东省地质灾害-气象预报预警为例

山东省地质灾害-气象预报预警研究中,受重力滑块启发,并通过分析研究地质构造、气象条件及已发地质灾害规律,发现了致灾营力当量定律。运用该定律将岩性、构造、降雨致灾因素作用统一到坡度致灾作用上,编制专用软件。以0.25km×0.25km为计算单元实现了全省空间范围的致灾营力当量计算。根据降雨诱发地质灾害危险性级别致灾营力当量阈值,追踪出地质灾害危险性预警级别。依据预警级别,发布地质灾害-气象预警信息。