南美发现最古老的铁矿-凯发k8官网

南美发现最古老的铁矿
文章来源:未知 文章作者:enread 发布时间:2011-05-20 03:21 字体: [ ] 
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archaeologists(考古学家) have discovered a 12,000-year-old iron 1 mine in chile that marks the oldest evidence of organized mining ever found in the americas, according to a report in the june issue of current 2. a team of researchers led by diego salazar of the universidad de chile found the 40-meter 3 near the 4 town of taltal in northern chile. it was dug by the huentelauquen people—the first settlers in the region—who used iron oxide as 5 for painted stone and bone instruments, and probably also for clothing and body paint, the researchers say.

the 6 duration and extent of the operation 7 the surprising cultural 8 of these ancient people. "it shows that [mining] was a labor-intensive activity demanding specific technical skills and some level of social cooperation transmitted through generations," salazar and his team write.

an estimated 700 cubic meters and 2,000 tons of rock were extracted from the mine. carbon dates for 9(木炭) and shells found in the mine suggest it was used continuously from around 12,000 years ago to 10,500 years ago, and then used again around 4,300 years ago. the researchers also found more than 500 hammerstones dating back to the earliest use of the mine.

"the regular exploitation of [the site] for more than a 10 … indicates that knowledge about the location of the mine, the properties of its iron oxides, and the techniques required to exploit and process these minerals were transmitted over generations within the huentelauquen cultural complex, 11 12 the first mining tradition yet known in america," the researchers write. the find extends "by several 13 the mining sites yet recorded in the americas."

before this find, a north american 14 mine dated to between 4,500 and 2,600 years ago was the oldest known in the americas.



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1 k4dz8     
n.氧化物
参考例句:
  • oxide is usually seen in our daily life.在我们的日常生活中氧化物很常见。
  • how can you get rid of this oxide coating?你们该怎样除去这些氧化皮?
2 zw2zq     
n.人类学
参考例句:
  • i believe he has started reading up anthropology.我相信他已开始深入研究人类学。
  • social anthropology is centrally concerned with the diversity of culture.社会人类学主要关于文化多样性。
3 vjhzp     
n./v.(挖)沟,(挖)战壕
参考例句:
  • the soldiers recaptured their trench.兵士夺回了战壕。
  • the troops received orders to trench the outpost.部队接到命令在前哨周围筑壕加强防卫。
4 wwiyh     
adj.海岸的,沿海的,沿岸的
参考例句:
  • the ocean waves are slowly eating away the coastal rocks.大海的波浪慢慢地侵蚀着岸边的岩石。
  • this country will fortify the coastal areas.该国将加强沿海地区的防御。
5 gi0yg     
n.天然色素,干粉颜料
参考例句:
  • the romans used natural pigments on their fabrics and walls.古罗马人在织物和墙壁上使用天然颜料。
  • who thought he might know what the skin pigment phenomenon meant.他自认为可能知道皮肤色素出现这种现象到底是怎么回事。
6 8vbx6     
adj.显著的,异常的,非凡的,值得注意的
参考例句:
  • she has made remarkable headway in her writing skills.她在写作技巧方面有了长足进步。
  • these cars are remarkable for the quietness of their engines.这些汽车因发动机没有噪音而不同凡响。
7 iarxw     
v.举例说明,阐明;图解,加插图
参考例句:
  • the company's bank statements illustrate its success.这家公司的银行报表说明了它的成功。
  • this diagram will illustrate what i mean.这个图表可说明我的意思。
8 ko9z3     
n.复杂(性),复杂的事物
参考例句:
  • only now did he understand the full complexity of the problem.直到现在他才明白这一问题的全部复杂性。
  • the complexity of the road map puzzled me.错综复杂的公路图把我搞糊涂了。
9 prgzj     
n.炭,木炭,生物炭
参考例句:
  • we need to get some more charcoal for the barbecue.我们烧烤需要更多的碳。
  • charcoal is used to filter water.木炭是用来过滤水的。
10 x7dzo     
n.一千年,千禧年;太平盛世
参考例句:
  • the whole world was counting down to the new millennium.全世界都在倒计时迎接新千年的到来。
  • we waited as the clock ticked away the last few seconds of the old millennium.我们静候着时钟滴答走过千年的最后几秒钟。
11 sokwv     
adv.因此,从而
参考例句:
  • i have never been to that city,,ereby i don't know much about it.我从未去过那座城市,因此对它不怎么熟悉。
  • he became a british citizen,thereby gaining the right to vote.他成了英国公民,因而得到了投票权。
12 6c04b889a235c3f1fd1ba84bc5ca1f80     
v.(使)巩固, (使)加强( consolidate的现在分词 );(使)合并
参考例句:
  • these measures are meant for consolidating the system of basic medical care. 这些举措旨在夯实基层医疗体系,让老百姓看大病不必出远门。 来自互联网
  • we are consolidating the chinese and english versions of our homepage. 我们将为您提供中英文版本一起的凯发k8天生赢家一触即发官网主页。 来自互联网
13 3dhxf     
n.一千年,千禧年
参考例句:
  • for two millennia, exogamy was a major transgression for jews. 两千年来,异族通婚一直是犹太人的一大禁忌。
  • in the course of millennia, the dinosaurs died out. 在几千年的时间里,恐龙逐渐死绝了。
14 hzxyu     
n.铜;铜币;铜器;adj.铜(制)的;(紫)铜色的
参考例句:
  • the students are asked to prove the purity of copper.要求学生们检验铜的纯度。
  • copper is a good medium for the conduction of heat and electricity.铜是热和电的良导体。
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