准平原

甘肃期准平原结束时代的古地磁年龄

Palaeogeomagnetic age at the termination of " gansu period " peneplain

前第四纪准平原化阶段形成了含金风化壳和含金砂砾层。

The gold-bearing weathering crust and auriferous-sandy gravel were formed by peneplanation at the Pre-Quaternary stage .

北海市区广泛分布较厚的第四纪松散沉积物，地貌上为似扇形准平原。

Quaternary loose and thicker deposits are widespread in Beihaitown , forming a fan-shaped peneplain in geomorphology .

研究地区的现代景观形态主要是风营力地形、荒漠平原及准平原。

The present forms of landscape in the research area are mainly aerodynamic relief , desert plain and pediment .

陆上侵蚀常夷平成准平原。风雨侵蚀了山坡的土壤。

Subaerial erosion occurs often with reduction to a peneplain . Wind & rain had denuded the mountain side of soil .

稳定的陆块、富金的原岩、湿热的气候、准平原的地貌等是重要的成矿条件。

The stable land block , gold rich primitive rock , humid-warm climate , peneplanated landform etc , are important metallogenetic conditions .

与第三纪时期准平原化相伴的红土化、类红土化作用，使基岩中的微量金富集到具有经济价值的程度。

The lateritization and other similar agents accompanied by Tertiary peneplanation enrich the trace amount of gold in basement rocks to a commercially significant extent .

中国大陆在古近纪之前构造比较稳定，以低平的准平原地貌为主。

The continent of China was relatively stable for a long time before the Paleogene , and its geomorphology was dominated by low and flat peneplains .

盆地和山脉是在晚白垩世形成的华北准平原上经新生代裂陷作用产生的。

The basin and the mountain were formed by Cenozoic rifting on the basis of the North China peneplain , which was formed in the Late Cretaceous .

古准平原化地形被不规则的峻峭的山谷所切割。一面是一座峻峭的石壁，一面是一排临湖的水阁。

Ancient peneplained surface is dissected by irregular steep sided valleys . On one side was a sharp towering cliff ; on the other , a building stood overlooking the water .

因此，花岗岩残积土在东南部省份普遍存在，工程中所遇的山地、丘陵、剥蚀准平原上都分布着残积土，是大部分工程建设的地基基础和地质环境重要介质。

Therefore , granite residual soils are widespread in the southeastern provinces and most of mountains , hills and erosional peneplain in engineering , which become the important material of the foundation and geological environment of most engineering construction .

而符合南海地区准平原化阶段的时代是在中中新世末至晚中新世（N12/N13）之间，在此时段普遍存在区域构造不整合接触和地层缺失、断裂、变形及火山活动等构造变动事件。

From middle Miocene to late Miocene there is a stage of peneplanation in the South China Sea and there are many tectonic events in this area , such as stratum unconformable contact , faults , deformation and magmatism .

从晚二迭叠世开始，全区处于相对稳定的剥蚀-堆积环境中，形成了厚度较大的磨拉石，并逐渐演化为三叠纪的准平原化环境。

Since the Late Permian , studied region was in a stable sedimentary setting , forming molasses with large thickness that overlie the olistostrome , and then evolved gradually into a Triassic pene-planed environment that is characterized by uplifting-erosion of ranges and accumulation of basins .