Age and Geochemical Characteristics of Major Mafic Dyke Swarms in the Southern Part of the Siberian Craton     

Tatiana V. DONSKAYA  Dmitry P. GLADKOCHUB  Richard E. ERNST  Sergei A. PISAREVSKY  Anatoliy M. MAZUKABZOV  Ulf S?DERLUND  Michael T.D. WINGATE  Michael A. HAMILTON  Elena I. DEMONTEROVA 《《地质学报》英文版》2016,90(Z1):125-126

正Several generations of mafic dyke swarms of different ages and geochemical characteristics cut Precambrian rocks of the southern part of the Siberian craton(Irkutsk Promontory).Each generation of dykes is related to a  相似文献   

ON SOME NEOLITHIC (AND POSSIBLY PALAEOLITHIC) FINDS IN MONGOLIA,SINKIANG AND WEST CHINA     

德日進  楊鍾健 《地质学报》1933,(1)

In the course of the past two years,when they were in the field with theThird American (1930) and the Haardt-Citroen (1931) Central Asiatic Expedi-tions,the authors of the present note had opportunities for making a series ofarchaeological observations ov  相似文献   

亞洲南部之人類遺跡     

德日進  楊鍾健 《地质论评》1936,1(6)

(一) 印度當一九三五年以前,除在馬德拉斯及恭達瓦瑞河(印度南部)在後於温熱時期的礫岩中所發見的著名的石英石器(齊安期之石斧)至少從老的舊石器講,沒有很確切的發現。  相似文献   

渤海海流概况及其输沙作用初析   总被引：14，自引：0，他引：14  

顾玉荷  修日晨 《黄渤海海洋》1996,14(1):1-6

本文讨论了渤海及黄河口附近海域的海洋动力状况，潮流和风暴急流是输送黄河入海泥沙的主要动力。  相似文献   

黄河口治理的当务之急是选择最佳入海路径     

顾玉荷  修日晨 《海岸工程》1995,14(3):42-46

清水沟流路进入老龄阶段，这不是一条理想的流路。黄河口治理泊当务之急是在清七断面以下选取一条新的最佳入海路径，这是长期稳定黄河入海流路的最佳选择。文中还对最佳流路的标准和进行科学论证的必要性进行了讨论。  相似文献   

Development versus conservation: evaluation of landscape structure changes in Dem?novská Valley,Slovakia     

KRTI?KA Luděk  TOM?íKOVá Ivana  RAKYTOVá Iveta 《山地科学学报》2018,15(6):1153-1170

This paper presents the changes of landscape structure in the Dem?novská Valley which ranks among the most valuable protected areas of Slovakia. The area was selected on the basis of changes associated with the rapidly growing tourism industry and the rise of an important destination in the center of Low Tatras National Park, Slovakia. To document any changes, we visually interpreted data from aerial and satellite images in three periods(1949, 2007 and 2013) and for predicting future changes we used land use planning documentation. Interpreted data were analyzed using overlay analysis and landscape metrics. Results showed extensive changes in the landscape structure mainly connected with the development of tourism infrastructure. We also identified long-term changes whose causes stem from the transformation of society and forest management in the past. The dynamics and extent of these changes may increase in the future. We propose to stop future development of ski slopes and expansion of related infrastructure, to focus on sustainability and environmentally friendly operation of the existing ski resort and to invest a substantial portion of profits to support projects aimed to preserve surrounding lands and wildlife.  相似文献   

Detecting exoplanets with FAST?     

Philippe Zarka  Di Li  Jean-Mathias Grie?meier  Laurent Lamy  Julien N.Girard  Sbastien L.G.Hess  T.Joseph W.Lazio  Gregg Hallinan 《天文和天体物理学研究(英文版)》2019,(2)

We briefly review the various proposed scenarios that may lead to nonthermal radio emissions from exoplanetary systems(planetary magnetospheres, magnetosphere-ionosphere and magnetospheresatellite coupling, and star-planet interactions), and the physical information that can be drawn from their detection. The latter scenario is especially favorable to the production of radio emission above 70 MHz. We summarize the results of past and recent radio searches, and then discuss FAST characteristics and observation strategy, including synergies. We emphasize the importance of polarization measurements and a high duty-cycle for the very weak targets that radio-exoplanets prove to be.  相似文献   

Tourmaline Composition of the K??lada? Au Deposit, U?ak, Turkey     

Gülcan BOZKAYA  Nurullah HANIL?I  Ivan A. BAKSHEEV  Vsevolod Yu. PROKOFIEV  David A. BANKS 《《地质学报》英文版》2014,88(Z2):520-521

Please refer to the attachment(s) for more details  相似文献   

Bioerosion on Late Pleistocene Marine Mollusks: A Paleoclimatological and Paleoecological Comparison of MIS 7 and MIS 5e with Modern Beaches (Río Negro, Argentina)     

Melisa P. CHARó  Gisela D. CHARó  Guillermo ACE?OLAZA  Jose L. CAVALLOTTO 《《地质学报》英文版》2022,96(4):1181-1198

The Late Pleistocene littoral ridges of southern South America, especially those of the north of Argentinean Patagonia, contain remains of mollusk shells with bioerosion traces. Eleven sites from marine isotope stages (2 from MIS 7, 4 from MIS 5e) and five sites from modern beaches from northern Río Negro Province, with 40 taxa (17 bivalves and 23 gastropods) were analyzed, in the area between west of Baliza San Matías and Las Grutas (41°S). Three ichnogenera were identified in deposits of MIS 7: Entobia, Gastrochaenolites (Domichnia) and Oichnus (Praedichnia) with one ichnospecies (G. torpedo). Six ichnogenera were identified in deposits of MIS 5e: Entobia, Meandropolydora, Pinaceocladichnus, Iramena, Caulostrepsis and Oichnus with one ichnospecies (O. simplex). Seven ichnogenera were identified from modern beaches: Entobia, Meandropolydora, Iramena, Caulostrepsis, Pinaceocladichnus, Gastrochaenolites (Domichnia) and Oichnus (Praedicnia), with two ichnospecies (O. simplex and O. paraboloides). On this basis, it is inferred that Pleistocene benthic communities were constituted from cheilostome bryzoans and polychaete annelids, together with drilling bivalves, predatory gastropods and overall warm-water species of mollusks. Of these, Chama iudicai was found on Plicatula gibbosa from MIS 7 and MIS 5e. The record of warm temperature species suggests a higher sea surface temperature (SST) than the present one and/or the influence of the warm southward Brazilian Current affecting the waters of Golfo San Matías. On the modern beaches surveyed, there is an increase in polychaete annelids, cheilostome bryzoans, temperate-cold species and drilling bivalves, as well as sandy substrate species, which together with an increase of Gastrochaenolites and Caulostrepsis, suggest a colder climate due to the greater influence of the Malvinas Current during the Holocene.  相似文献   

浅成热液型Pb-Zn-(Ag)-(Au)-(Cu)多金属矿床研究进展     

高建京  叶会寿  陈懋弘  木合塔尔.买买提明 《矿床地质》2010,29(Z4):185-186

  相似文献