洋中脊

Confirmation of MORB and pillow OIB in Hongliugou ophiolite melange belt in the north.

确定北部红柳沟蛇绿混杂岩带中洋脊玄武岩和枕状洋岛玄武岩的存在。

OCEAN RIDGE MAGMATISM;METAMORPHISM OF OCEANIC CRUST;Ocean floor metamorphism - Sarmiento Ophiolite, Chile;Chemical fluxes in oceanic crust - the 'MEGALEG';Chemical Changes in Oceanic Crust - Troodos Ophiolite;VARIATION IN Sr ISOTOPIC COMPOSITION of SEAWATER WITH TIME: the plate tectonics connexion

洋脊的岩浆作用；洋底壳的变质作用；海底变质作用-Sarmiento蛇绿岩，智利；洋底壳的化学变迁；洋底壳的化学变化-Troodos蛇绿岩；海水中锶同位素随时间的变化：板块构造的联系

About 100 million years from now the present-day Mid-Atlantic Ridge will be subducted and the continents will come closer together.

大约在距今一亿年之后，大西洋的中洋脊将会隐没，大陆和大陆之间则会越靠越近了。

And then a local extension took place in the region of intra-Eastern Tethys when the India plate drifted to the north but suffered the resistance from the Lhasa block, contemporarily, the intra-oceanic subduction are triggered, subsequently, magmas derived from a partial melting of mantle wedge which suffered from the modification by subducted continental marginal clastics and oceanic sediments upwelled along the oceanic ridges, forming several small marginal basins during 120～128 Ma, and thus lead to the so-called SSZ-type oceanic crust.

于120～128Ma，一些规模较小的边缘洋盆形成，卷入陆缘碎屑和洋壳沉积的地幔楔发生熔融产生岩浆，沿着破裂的扩张脊上涌产生了具有TNT负异常的SSZ型新洋壳，期间产生了俯冲洋壳重熔作用，标志着年轻的热的洋壳俯冲形成的埃达克岩侵入于仁布SSZ蛇绿岩地幔橄榄岩中。

In the boreal summer, there are two STH ridge lines in mid-Pacific separated by the mid-Pacific trough, of which the north part (call as mid-Pacific STH ridge line) is joined with the west Pacific STH, and the south is belonged to the North America STH. The structure of them is winter pattern that the ridge axis slopes southward against height. Litter differences lie in vertical circulation structure of the steady and instantaneous mid-Pacific STH, and descent flow exists around ridge axis.

北半球夏季，中太平洋地区中高层存在双副高脊线，其中偏北的一条与西太平洋副高相连，偏南的一条系北美副高西伸脊线，其间为洋中槽；副高结构表现为冬季型，即高压脊轴随高度向南倾斜；中太平洋副高垂直环流的定常结构与瞬时结构差别不大，副高脊轴附近均有下沉气流存在。

The results show that the white thick-bedded siliceous rocks have high contents of SiO2 and Al2O3 and high ratios of Al/ and Al2O3/(Al2O3+ Fe2O3). The ∑REE are low, and the North American shale-normalized REE patterns are characterized by enrichment of LREE and absence of Eu and Ce anomalies, which suggest that the white thick-bedded siliceous rocks might have been formed in the continental margin environment and affected significantly by terrigenous constituents. The anatase-rich siliceous rocks have high contents of TiO2, Fe2O3, Cu and V but low Al/(Al + Fe+ Mn) and Al2O3/(Al2O3 + Fe2O3) ratios. The ΣREE are high, the North American shale-normalized REE patterns are obviously characterized by left-oblique to flat styles of curves and slight negative Ce anomalies, implying that they might have been formed in an oceanic ridge environment.

研究结果表明，呈厚层状产出的无矿白色硅质岩具较高的SiO2、Al2O3含量及Al/、Al2O3/(Al2O3+Fe2O3)比值，稀土元素总量很低，其北美页岩标准化配分模式为向右倾的曲线，无明显铈异常和铕异常，表明其形成于受陆源影响的大陆边缘构造环境；赋矿岩系中薄层状富钛硅质岩的TiO2、Fe2O3、Cu、V含量较高，但Al/、Al2O3/(Al2O3+Fe2O3)比值较低，稀土元素总量较高，北美页岩标准化曲线为明显左倾型－平坦型，具弱的负铈异常，表明其形成于洋脊及附近环境。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。