Submarine temperature, pressure, gas compositions, geothermalgradient and syngenetic water salinity control the depth of hydrate zone basement.
海底温度和压力、地热梯度、气体成分、同生水盐度等控制着水合物稳定带基底的深度和厚度。
2
Under the influence of the subduction, the source mantle of the potassic lamprophyres has a high geothermalgradient and oxygen fugacity.
由于这种作用的影响，使钾质煌斑岩的源区地幔处于地温梯度高、氧逸度高的不稳定状态。
3
But the level of maturity of organic matter in the source rocks is obviously lower, because the lower tertiary source beds are of shallower burial and smaller geothermalgradient.