土壤测量样品处理方法对金异常圈定的影响与应用——以湘东北棉花坡矿区为例     

徐昊 《地质与勘探》2017,53(4):686-693

在地质勘探的普查和详查工作中,土壤地球化学的指示作用是重要的决定性因素之一。随着地表及浅部矿产的开发,边深部盲矿体的找矿难度不断加大。按照目前的样品处理方法及技术要求,岩金矿区的矿化地段土壤测量分析数据被削弱,元素异常下限值偏低。为了解决异常贫化带来的异常圈定问题,本次研究对土壤样品的加工进行改进和调整。首次提出将野外采取的金矿土壤测量样细分,烘干处理后,不再进行过筛处理,并在湘东北醴陵市棉花坡金矿区的找矿普查工作中应用。对该区金矿土壤测量样品野外加工过筛与不过筛检测结果对比分析,未过筛样品能更客观、真实地反映矿区Au元素异常值情况,有利于指导找矿,取得了良好的找矿效果。因此,本次试验工作方法对指导类似金矿区土壤测量样品野外加工处理具有一定的借鉴意义。  相似文献   

藏南拿日雍错片麻岩穹窿中新世淡色花岗岩的形成过程:变泥质岩部分熔融与分离结晶作用   总被引：8，自引：4，他引：4  

高利娥  高家昊  赵令浩  侯可军  唐索寒 《岩石学报》2017,33(8):2395-2411

拿日雍错片麻岩穹窿位于特提斯喜马拉雅带的东部,穹窿边部淡色花岗岩脉形成于21.8±0.3Ma,穹窿核部主体淡色花岗岩的结晶年龄为20.1±0.1Ma,其中1件样品记录了~17.3Ma热液蚀变事件。大部分淡色花岗岩具有以下特征:(1)较高的Si O2(72.9%),Al2O3(14.7%)和A/CNK(1.1),较低的Fe O、Mg O、Mn O和Ti O2;(2)高度变化的大离子亲石元素(如Rb、Sr、Ba)和高场强元素(如Nb、Ta、Hf、Th)和Rb/Sr、Nb/Ta、Zr/Hf比值;(3)富集轻稀土元素,亏损重稀土元素,Eu和Nd都显示负异常(Eu/Eu*0.7,Nd/Nd*=0.5~0.8);(4)Sr同位素比值变化范围较大(87Sr/86Sr(t)=0.7132~0.7330),但Nd同位素比值一致(εNd(t)=-12.4~-10.9)。这些特征表明:拿日雍错淡色花岗岩形成于20Ma,是变泥质岩部分熔融作用的产物,经历了不同程度的斜长石、锆石、独居石、磷灰石、富Ti矿物等的分离结晶作用。  相似文献   

Steroid sex hormone dynamics during estradiol-17β induced gonadal differentiation in Paralichthys olivaceus(Teleostei)     

孙鹏  尤锋  刘梦侠  吴志昊  文爱韵  李军  徐永立  张培军 《中国海洋湖沼学报》2010,(2)

Steroid sex hormones,such as estradiol-17β(E2)and testosterone(T),are important regulators of sex change in fish.In this study,we examined the effects of E2 treatment on the dynamics of E2 and T during gonadal differentiation in the olive flounder Paralichthys olivaceus using histology and radioimmunoassay(RIA).Flounder larvae were divided into five groups(G0–G4),and fed with 0 (control),0.2,2,20 and 100 mg E2/kg feed from 35 to 110 day post hatching(dph).Fish growth in the G1 and G2 groups was not significantly different from that of the control group(P0.05),while fish in the G3 and G4 groups were less active and showed growth depression and high mortality.The gonads of fish in the G3 and G4 groups were smaller and surrounded by hyperplastic connective tissue.The frequency of females in the G0–G4 groups was 54.5%,75.0%,100%,100%and 93.3%,respectively.The RIA analyses of E2 and T showed that T levels decreased during gonadal differentiation,and increased slightly at the onset of ovarian differentiation,while E2 levels increased gradually and peaked at the onset of ovarian differentiation in the control group.In the E2-treated groups,T levels decreased before the onset of ovarian differentiation.E2 levels were high on the 48 dph,but declined to a lower level on the 54 dph, and then increased gradually during gonadal differentiation.And a sharp increase of E2 levels were observed in all E2-treated groups at the onset of ovarian differentiation.The data suggest that T and E2 play important roles during gonadal differentiation,and an E2 dose of 2 mg/kg feed could induce sex reversal in P.olivaceus.  相似文献   

Steroid sex hormone dynamics during estradiol-17β induced gonadal differentiation in Paralichthys olivaceus (Teleostei)     

孙鹏  尤锋  刘梦侠  吴志昊  文爱韵  李军  徐永立  张培军 《中国海洋湖沼学报》2010,28(2):254-259

Steroid sex hormones, such as estradiol-17β (E2) and testosterone (T), are important regulators of sex change in fish. In this study, we examined the effects of E2 treatment on the dynamics of E2 and T during gonadal differentiation in the olive flounder Paralichthys olivaceus using histology and radioimmunoassay (RIA). Flounder larvae were divided into five groups (G0-G4), and fed with 0 (control), 0.2, 2, 20 and 100 mg E2/kg feed from 35 to 110 day post hatching (dph). Fish growth in the G1 and G2 groups was not significantly different from that of the control group (P>0.05), while fish in the G3 and G4 groups were less active and showed growth depression and high mortality. The gonads of fish in the G3 and G4 groups were smaller and surrounded by hyperplastic connective tissue. The frequency of females in the G0-G4 groups was 54.5%, 75.0%, 100%, 100% and 93.3%, respectively. The RIA analyses of E2 and T showed that T levels decreased during gonadal differentiation, and increased slightly at the onset of ovarian differentiation, while E2 levels increased gradually and peaked at the onset of ovarian differentiation in the control group. In the E2-treated groups, T levels decreased before the onset of ovarian differentiation. E2 levels were high on the 48 dph, but declined to a lower level on the 54 dph, and then increased gradually during gonadal differentiation. And a sharp increase of E2 levels were observed in all E2-treated groups at the onset of ovarian differentiation. The data suggest that T and E2 play important roles during gonadal differentiation, and an E2 dose of 2 mg/kg feed could induce sex reversal in P. olivaceus.  相似文献   

黄河三角洲湿地高光谱遥感研究进展     

李忠伟  郭防铭  任广波  马毅  辛紫麒  黄文昊  隋昊  孟乔 《海洋科学》2023,47(5):161-175

黄河三角洲湿地是我国暖温带最广阔、最完整、最年轻的滨海湿地,是黄河流域生态保护和高质量发展的重要组成部分,具有重要的生态保护和科学研究价值。物种多样、生境复杂、变化剧烈是黄河三角洲湿地的重要特点,高光谱遥感是黄河三角洲湿地生态监测的重要技术手段。本文首先阐述了高光谱遥感在河口湿地开展植被、土壤和水质等基本要素监测方面的优势,之后重点综述了其在黄河三角洲滨海湿地开展植被遥感监测、土壤参数反演和水质参数反演的研究进展,最后基于黄河三角洲湿地生态监测现状,提出了高光谱遥感的未来需求和发展展望。  相似文献   

柳林区块煤层气井煤粉产出影响因素分析     

魏迎春  谢天成  杨亚锋  位金昊  王亚东  孟涛  张劲 《中国煤炭地质》2022,(5):1-5

煤粉产出是影响煤层气开发的关键因素,查明煤粉产出的影响因素对于煤粉预防和管控具有重要意义。基于柳林区块的地质背景和煤层气开发情况,通过对现场排采井的生产曲线及排采过程和钻井过程中产出煤粉的研究,从静态因素和动态因素两方面分析了影响研究区煤层气井煤粉产出的控制因素。研究表明,由于煤粉问题导致修井作业造成的排采不连续对煤储层的伤害非常大,修井作业后重新排采,产气量很难恢复到原有的稳定产气水平。煤储层中镜质组和黏土矿物的占比越高,越容易产生煤粉。不同类型煤体结构煤储层产出煤粉浓度：Ⅲ类煤>Ⅱ类煤>Ⅰ类煤。煤层结构越复杂,含夹矸层数越多,越容易产生煤粉。多分支和单分支水平井产出的煤粉浓度普遍高于直井和定向井。水平井水平段井眼沿最大水平地应力方向钻进更容易产生煤粉,井斜越大越容易产生煤粉。排采速度突然增加,会导致煤粉产出增多,煤粉粒度呈现双峰分布。  相似文献   

全国变质岩原岩恢复学术讨论会在山东烟台召开     

昊泽霖 《地球化学》1984,(1):21-21

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碟形浮标观测方向波谱误差分析及修正     

高家俊  庄士贤等 《海洋工程》2003,21(1):24-33

改进了方向波谱的分析方法及噪声谱经验公式，使本法随测波环境及仪器特性自动修正经验参值，更易于实际应用。基于Maximum heave/pitch quad-spectrum method，由时域及频率域上的浮标动力反应数值计算，推求反应增益因子及相位延迟项，并进一步将其导入方向波谱计算，使其能修正资料浮标对波浪之轴不对称动态反应所造成的相位延迟不一致及主波向误差。经数值仿真验证，该方法的确能消减因资料浮标对波浪之轴不对称动态反应所造成的相位延迟及对主波向估算所造成之影响。应用花莲现场观测资料验证改良之主波向估算方法，得出是否考虑波浪运动与浮标运动间之振幅响应因子及相位延迟因子，所得之主波向的差异介于0－12℃之间。  相似文献   

中国平均海面与国家高程基准之间的偏差   总被引：1，自引：0，他引：1  

余兆康  高家镛 《台湾海峡》1989,8(2):97-104

本文以我国正式公布的1985国家高程基准为依据,将国家Ⅰ等水准位测量资料与全国各主要验潮站测定的当地多年平均海面联系起来,统一推算出各地平均海面与1985国家高程基准之间的高程,定量地讨论了二者之间的偏差特性并分析其可能的成因。  相似文献   

基于无人机航摄影像的喀斯特地区裸岩信息提取及景观格局分析     

张志慧  刘雯  李笑含  朱靖轩  张洪涛  杨东  徐超昊  徐宪立 《地球信息科学学报》2020,22(12):2436-2444

喀斯特地区不同石漠化等级的结构和格局是实现区域石漠化治理的重要基础信息,受技术手段的限制,目前这方面的研究进展仍非常缓慢。随着无人机技术的快速发展,高精度的地表信息获取越来越方便、且成本较低。本研究利用无人机影像,对比了基于像元的非监督和监督分类方法以及面向对象的分类方法在裸岩信息提取中的表现,发现面向对象分类结果具有更高精度。基于获得的裸岩分布信息的研究结果表明：① 岩石平均斑块面积与裸岩率呈负相关的关系,岩石斑块个数与裸岩率呈正相关关系;② 通过对比不同裸岩率（11%、20%、29%和48%）基质的景观斑块指数、景观形状指数和景观破碎度指数对不同裸岩率的景观分布的影响,从而表明了在不同的石漠化地区随着裸岩率的增加,岩石形状指数与岩石破碎度指数均逐渐增加,进而表明石漠化程度越严重;③ 裸岩率不同的地区表现不同的分布形态和斑块特征,裸岩率越高,岩石越破碎,斑块分布较为分散。小尺度斑块景观格局与区域的生态过程有着重要关系,开展小尺度景观格局的研究会深化区域尺度石漠化发展过程的理解。石漠化地区的小尺度斑块景观格局变化影响区域的生态过程,对以后的石漠化过程以及未来石漠化演变的发展有重要的启示作用。  相似文献