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GAC - Newfoundland and Labrador Section Abstracts: 2016 Spring Technical Meeting GAC -纽芬兰和拉布拉多部分摘要:2016年春季技术会议
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2016-03-23 DOI: 10.4138/ATLGEOL.2016.005
C. White
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引用次数: 0
Atlantic Geoscience Society Abstracts: 42nd Annual Colloquium & General Meeting 2016 大西洋地球科学学会文摘:2016年第42届学术年会暨大会
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2016-03-14 DOI: 10.4138/ATLGEOL.2016.004
C. White
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引用次数: 1
Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada 加拿大新斯科舍省布雷顿角岛西南部Creignish Hills - North Mountain地区变质岩和深成岩的场关系、年龄和构造背景
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2016-02-04 DOI: 10.4138/ATLGEOL.2016.003
C. White, S. Barr, D. Davis, David S. Swanton, J. Ketchum, P. Reynolds
The Creignish Hills and North Mountain areas of southwestern Cape Breton Island consist mostly of Neoproterozoic rocks typical of the Ganderian Bras d’Or terrane. U-Pb ages presented here for detrital zircon in the Blues Brook Formation of the Creignish Hills confirm a depositional age no greater than about 600 Ma. Although it is possible that some components of the formation are much older, similarities in rock types and field relations suggest that this is not the case. It is likely that the equivalent Malagawatch Formation of the North Mountain area, as well as high-grade metasedimentary rocks of the Melford Formation and Chuggin Road complex in the Creignish Hills and Lime Hill gneiss complex in the North Mountain area, represent the same or stratigraphically equivalent units as the Blues Brook Formation. The minimum ages of all of these units are constrained by cross-cutting syn- and post-tectonic plutons with ages mostly between 565 and 550 Ma, indicating that sediments were deposited, regionally metamorphosed, deformed, and intruded by plutons in less than 40–50 million years. The assemblage of pelitic, psammitic, and carbonate rocks indicates that a passive margin in a tropical climate was quickly changed to an active Andean-type continental margin in which voluminous calcalkaline dioritic to granitic plutons were emplaced. This sedimentary and tectonic history is characteristic of the Bras d’Or terrane and is shared by its likely correlative, the Brookville terrane in southern New Brunswick.
布雷顿角岛西南部的Creignish丘陵和北山地区主要由新元古代的岩石组成,这些岩石是典型的Ganderian Bras d 'Or地体。本文对克瑞尼什山蓝溪组碎屑锆石进行了U-Pb年龄测定,证实其沉积年龄不超过600 Ma。虽然地层的某些成分可能要古老得多,但岩石类型和野外关系的相似性表明情况并非如此。北山地区等效的Malagawatch组,以及北山地区的Creignish Hills的Melford组和Chuggin Road杂岩和Lime Hill片麻岩杂岩的高品位变质沉积岩可能与Blues Brook组代表相同或地层等效的单元。所有单元的最小年龄均受同构造期和后构造期交叉岩体的约束,年龄大多在565 ~ 550 Ma之间,表明沉积物在不到4000 ~ 5000万年的时间内被岩体沉积、区域变质、变形和侵入。泥质、沙质和碳酸盐岩的组合表明,热带气候的被动边缘迅速转变为活动的安第斯型大陆边缘,其中有大量钙碱性闪长岩和花岗质岩体。这一沉积和构造历史是Bras d 'Or地体的特征,与它可能相关的新不伦瑞克南部的Brookville地体也具有相同的特征。
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引用次数: 9
Reassessment of vertebrate ichnotaxa from the Upper Carboniferous ‘Fern Ledges’, Lancaster Formation, Saint John, New Brunswick, Canada 加拿大新不伦瑞克省圣约翰兰开斯特组上石炭世“蕨类岩壁”脊椎动物区系的重新评估
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2016-01-18 DOI: 10.4138/ATLGEOL.2016.002
M. Stimson, Randall F. Miller, S. Lucas
Vertebrate ichnotaxa described by George Frederic Matthew in 1910 from the Upper Carboniferous (Lower Pennsylvanian) ‘Fern Ledges’ of Saint John, New Brunswick, were dismissed as dubious trackways by previous authors. Thus, three new ichnospecies Matthew described appeared in the 1975 Treatise on Invertebrate Paleontology as “unrecognized or unrecognizable” and were mostly forgotten by vertebrate ichnologists. These traces include Hylopus (?) variabilis, Nanopus (?) vetustus and Bipezia bilobata . One ichnospecies, Hylopus (?) variabilis , here is retained as a valid tetrapod footprint ichnotaxon and reassigned to the ichnogenus Limnopus as a new combination, together with other poorly preserved specimens Matthew labeled, but never described. Nanopus (?) vetustus and Bipezia bilobata named by Matthew in the same paper, have been reexamined and remain as nomina dubia.
乔治·弗雷德里克·马修于1910年在新不伦瑞克省圣约翰的上石炭世(宾夕法尼亚下)“蕨类岩”中描述的脊椎动物ichnotaxa被先前的作者视为可疑的轨迹而不予考虑。因此,在1975年的《无脊椎动物古生物学专著》(Treatise on vertebrate Paleontology)中,马修所描述的三种新的鱼种被认为是“未被认识或无法识别的”,基本上被脊椎动物技术学家遗忘了。这些痕迹包括Hylopus (?) variabilis, Nanopus (?) vetustus和Bipezia bilobata。其中一个鱼种,Hylopus (?) variabilis,在这里被保留为一个有效的四足动物足迹鱼分类群,并作为一个新的组合被重新分配到Limnopus鱼属,与其他保存较差的标本一起,马修标记,但从未描述过。由Matthew在同一篇论文中命名的Nanopus (?) vetustus和Bipezia bilobata已被重新审查并保留为名义dubia。
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引用次数: 4
Redescription of tetrapod trackways from the Mississippian Mabou Group, Lepreau Falls, New Brunswick, Canada 加拿大新不伦瑞克省Lepreau Falls,密西西比Mabou群四足动物足迹的重新描述
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2016-01-14 DOI: 10.4138/ATLGEOL.2016.001
M. Stimson, Randall F. Miller, S. Lucas, A. Park, S. Hinds
Red-bed strata exposed at Lepreau Falls, southern New Brunswick, were originally interpreted as belonging to the Triassic Lepreau Formation. Poorly preserved tetrapod trackways within the strata were previously assigned to two ichnospecies; one to a new Triassic ichnospecies, Isocampe lepreauense Sarjeant and Stringer, and the other to Rhynchosauroides cf. R. franconicus (Heller). Both were attributed to reptiles. Subsequent mapping of the rocks and reassignment of the exposed strata at Lepreau Falls to the Mississippian Mabou Group prompted our re-examination of the trackway fossils. Isocampe lepreauense was described from a specimen block preserving three trackways and the original description was based on erroneous interpretation of extramorphological digit drags. Rhynchosauroides cf. R. franconicus was a tentative assignment in a letter accompanying a cast in the New Brunswick Museum, but was never formally published. We redescribe and re-interpret all the trackways as gait variations produced by temnospondyls, and most closely resemble the Carboniferous ichnotaxon Matthewichnus .
在新不伦瑞克省南部Lepreau瀑布暴露的红层地层最初被解释为属于三叠纪Lepreau组。地层中保存较差的四足动物足迹以前被划分为两个鱼科;一个属于一个新的三叠纪鱼种,Isocampe lepreauense Sarjeant和Stringer,另一个属于Rhynchosauroides cf. R. franconicus (Heller)。两者都被认为是爬行动物。随后对Lepreau瀑布的岩石进行了测绘,并将暴露的地层重新划分为密西西比马布群,这促使我们重新研究了足迹化石。对lepreauense等坎贝的描述是基于一个保存了三条径迹的标本块,而最初的描述是基于对外变质数字拖的错误解释。Rhynchosauroides cf. R. franconicus是在新布伦瑞克博物馆的一封随附的信中暂定的名称,但从未正式发表。我们将所有的足迹重新描述和解释为由temnospondyls产生的步态变化,并且最接近石石纪的鱼分类单元Matthewichnus。
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引用次数: 5
Assessing patterns of dissolved methane in shallow aquifers related to Carboniferous and Triassic sedimentary basins, Nova Scotia, Canada 加拿大新斯科舍省石炭纪和三叠纪沉积盆地浅层溶解甲烷模式评估
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2015-12-09 DOI: 10.4138/ATLGEOL.2015.009
G. Kennedy, J. Drage
The study examines patterns of groundwater methane in shallow aquifers located in Carboniferous and Triassic sedimentary basins in Nova Scotia to improve our understanding of the factors influencing the observed distribution. A combined total of over 800 dissolved methane samples were collected from water wells during surveys conducted in 1975 and 2013. Statistical analyses of the methane data did not detect a significant difference between groupings of methane concentrations for aquifer type, bedrock group, and distance to wetlands. A significant difference, however, was observed between sedimentary basins and bedrock formations, which was largely attributed to localized higher methane concentrations found in the Stellarton Formation/basin compared to other on-shore sedimentary basins of the province. A significant difference was also found between groupings of methane data based on the distance to major stream systems, which was used to indicate topographic position (i.e., valley vs. upslope). The low sample density and percentage of detectable methane concentrations, and the multiple sources of dissolved methane in shallow groundwater in sedimentary basins made it difficult to detect and interpret statistical and spatial trends. Geochemical classification indicates that elevated dissolved methane in well water is associated with sodium dominated groundwater.
研究了新斯科舍省石炭系和三叠系沉积盆地浅层地下水甲烷的分布规律,以提高我们对影响观测分布的因素的认识。在1975年和2013年进行的调查中,总共从水井中收集了800多个溶解甲烷样本。对甲烷数据的统计分析没有发现含水层类型、基岩组和与湿地距离的甲烷浓度分组之间存在显著差异。然而,沉积盆地和基岩地层之间存在显著差异,这主要归因于与该省其他陆上沉积盆地相比,Stellarton组/盆地的甲烷浓度较高。根据与主要河流系统的距离,甲烷数据分组之间也存在显著差异,这些数据用于指示地形位置(即山谷与上坡)。沉积盆地浅层地下水中溶解甲烷的来源多,样品密度低,可检测甲烷浓度百分比低,因此难以检测和解释统计趋势和空间趋势。地球化学分类表明,井水中溶解甲烷含量升高与钠为主的地下水有关。
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引用次数: 5
Establishing geochemical baselines in forest soils for environmental risk assessment in the Montague and Goldenville gold districts, Nova Scotia, Canada 加拿大新斯科舍省Montague和Goldenville金矿区森林土壤地球化学基线的建立及其环境风险评价
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2015-12-09 DOI: 10.4138/ATLGEOL.2015.017
M. Parsons, M. Little
Mine tailings at historical gold districts in Nova Scotia, Canada, contain high concentrations of arsenic (As) and mercury (Hg), which may represent a risk to ecosystems and human health. Two sites, Montague and Goldenville, are of particular concern as tailings are located close to residences and are occasionally used for racing off-road vehicles. Risk-assessment calculations require knowledge of the naturally occurring concentrations of As and Hg in soils overlying mineralized bedrock within these gold districts. In this study, we collected samples of the top 0–5 cm of surface soil (the Public Health layer) from 46 sites near Montague, and 39 sites near Goldenville. Samples of individual soil horizons (H, Ae, B, and C) were also taken from selected sites to evaluate the vertical distribution of elements in the soil profile. Results show that the concentrations of As and Hg in all soil horizons are generally higher down-ice, southeasterly, of the ore zones in both districts, reflecting glacial erosion and transport of mineralized bedrock. Analysis of the top 0–5 cm of soils shows the following ranges in As and Hg concentrations (<2 mm size fraction): Montague: As, 4–273 mg/kg (median 42 mg/kg); Hg, 72–490 µg/kg (median 164 µg/kg); Goldenville: As, 2–140 mg/kg (median 13 mg/kg); Hg, 39–312 µg/kg (median 114 µg/kg). In general, the concentrations of As are highest in the B and C horizons, whereas Hg concentrations are highest in humus (H). Results from this study have been used to assess the distribution of tailings at these sites, and to help guide risk-management decisions.
加拿大新斯科舍省历史黄金地区的矿山尾矿含有高浓度的砷(As)和汞(Hg),可能对生态系统和人类健康构成风险。蒙塔古(Montague)和戈尔登维尔(Goldenville)这两个地点尤其令人担忧,因为尾矿靠近居民区,偶尔会被用于越野车比赛。风险评估计算需要了解这些金矿区内矿化基岩上的土壤中砷和汞的自然浓度。在这项研究中,我们从Montague附近的46个地点和Goldenville附近的39个地点收集了表层土壤顶部0-5 cm(公共卫生层)的样本。选取不同土壤层(H、Ae、B、C),评价土壤剖面中元素的垂直分布。结果表明,两区矿化带各土层As和Hg含量总体上在东南方向冰下较高,反映了冰川侵蚀和矿化基岩的搬运作用。对表层0-5 cm土壤的分析显示,砷和汞浓度(<2 mm粒径部分)的范围如下:蒙塔古:砷,4-273 mg/kg(中位数42 mg/kg);Hg, 72-490µg/kg(中位数164µg/kg);Goldenville: As, 2-140 mg/kg(中位数13 mg/kg);Hg, 39-312µg/kg(中位数114µg/kg)。总的来说,砷在B层和C层的浓度最高,而汞在腐殖质(H)层的浓度最高。本研究的结果已用于评估这些地点的尾矿分布,并有助于指导风险管理决策。
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引用次数: 2
Impact of historical gold mining activities on marine sediments in Wine Harbour, Nova Scotia, Canada 加拿大新斯科舍省Wine港历史金矿开采活动对海洋沉积物的影响
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2015-12-05 DOI: 10.4138/ATLGEOL.2015.016
M. Little, M. Parsons, B. Law, T. Milligan, John N. Smith
Past investigations at historical gold (Au) districts in Nova Scotia, Canada have identified elevated concentrations of arsenic (As) and mercury (Hg) in nearby sediments and waters. These metal(loid)s are derived from erosion of mineralized bedrock, and the disposal of mine tailings into the environment during early operations. The Wine Harbour gold district is located along the eastern shore of Nova Scotia, and produced 1329 kg of Au from 75 581 tonnes of crushed rock from 1862 to 1939. The gold occurs in arsenopyrite-bearing quartz-carbonate veins and was extracted using stamp milling and Hg amalgamation. Historical maps document tailings deposits near former stamp mill sites; however, the extent to which these mine wastes influence environmental quality in the adjacent marine environment is uncertain. In this study, we measured metal(loid) concentrations in tailings, marine sediments, and surface waters to assess the lateral and vertical extent of mining-related impacts on Wine Harbour. Chemical analyses of terrestrial and intertidal tailings reveal high concentrations of both As (86–196 000 mg/kg) and Hg (444–320 000 µg/kg). Analyses of marine sediments show a wide range in both As (4–568 mg/kg) and Hg (<5–7430 µg/kg) concentrations. In general, the highest metal(loid) concentrations in sediments were recorded down-gradient of stamp mill sites. Elevated concentrations were also detected in sediments underlying an active mussel aquaculture operation at the western end of the harbour. Results from this study have been used to help assess potential ecosystem and human health risks associated with historical gold mine wastes in the Wine Harbour area.
过去在加拿大新斯科舍省历史上的金(Au)区进行的调查发现,附近沉积物和水中的砷(As)和汞(Hg)浓度升高。这些金属(样物质)来自矿化基岩的侵蚀,以及在早期作业期间将矿山尾矿排入环境中。葡萄酒港黄金产区位于新斯科舍省东岸,从1862年到1939年,从75 581吨碎石中生产了1329公斤的金。金赋存于含毒黄铁矿的石英-碳酸盐脉中,采用压印磨矿和汞汞汞齐法提取。历史地图记录了前邮票厂厂址附近的尾矿;然而,这些矿山废弃物对邻近海洋环境质量的影响程度是不确定的。在这项研究中,我们测量了尾矿、海洋沉积物和地表水中的金属(样蛋白)浓度,以评估采矿对葡萄酒港的横向和纵向影响程度。对陆源和潮间带尾矿的化学分析表明,砷(86-196 000 mg/kg)和汞(444 - 32 000µg/kg)的浓度都很高。对海洋沉积物的分析表明,砷(4-568 mg/kg)和汞(< 5-7430µg/kg)的浓度范围很广。总的来说,沉积物中金属(样物质)浓度最高的是冲模厂址的下坡。在港口西端一个活跃的贻贝养殖作业的底泥中也检测到浓度升高。本研究的结果已用于帮助评估葡萄酒港地区历史金矿废物对生态系统和人类健康的潜在风险。
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引用次数: 7
Atlantic Universities Geoscience Conference 2015: 65th Annual Conference, October 22-24, 2015 2015年大西洋大学地球科学会议:第65届年会,2015年10月22-24日
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2015-11-27 DOI: 10.4138/ATLGEOL.2015.015
C. White
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引用次数: 0
19th to early 20th century geology lectures in Saint John, New Brunswick, Canada 19世纪到20世纪初在加拿大新不伦瑞克的圣约翰做地质学讲座
IF 1.6 4区 地球科学 Q2 GEOLOGY Pub Date : 2015-10-28 DOI: 10.4138/ATLGEOL.2015.014
Randy F. Miller, D. N. Buhay
Saint John, New Brunswick, has a long history of popularization of geology dating back to lectures presented in the 1820s. The first lecture series that included geology and presented to a public audience in 1824 was followed by almost a century of public engagement and presentation of geology topics to a relatively small city of 20 000 to 30 000 people. Lectures were often very general about the science of geology, specific as to the nature of minerals and mining in New Brunswick, and leading edge concerning the first discoveries of significant fossils in the Province. Even though it was a relatively small community, Saint John had an abundance of knowledgeable people, and institutions for presentation and discussion at the Saint John Mechanics’ Institute and the Natural History Society of New Brunswick.
新布伦瑞克省的圣约翰在地质学普及方面有着悠久的历史,可以追溯到19世纪20年代的讲座。1824年,第一个包括地质学的系列讲座向公众展示,随后的一个世纪里,公众参与并向一个只有2万到3万人口的相对较小的城市展示地质学主题。讲座内容通常是关于地质科学的概括性内容,具体到新不伦瑞克省的矿物和采矿性质,以及该省首次发现的重要化石。尽管圣约翰是一个相对较小的社区,但它有很多知识渊博的人,圣约翰力学研究所和新不伦瑞克自然历史学会也有演讲和讨论的机构。
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引用次数: 0
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Atlantic Geology
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