Quantifying the amounts of various igneous lithologies in Vesta’s crust allows the estimation of petrologic ratios that describe the asteroid’s global differentiation and subsequent magmatic history. The eucrite:diogenite (Euc:Diog) ratio measures the relative proportions of mafic and ultramafic components. The intrusive:extrusive (I:E) ratio assesses the effectiveness of magma ascent and eruption. We estimate these ratios by counting numbers and masses of eucrites, cumulate eucrites, and diogenites in the world’s meteorite collections, and by calculating their proportions as components of crustal polymict breccias (howardites) using chemical mixing diagrams and petrologic mapping of multiple thin sections. The latter two methods yield a Euc:Diog ratio of ∼2:1, although meteorite numbers and masses give slightly higher ratios. Surface lithologic maps compiled from spectra of Dawn spacecraft instruments (VIR and GRaND) yield Euc:Diog ratios that bracket estimates of Euc:Diog from the meteorites. The I:E ratios from HEDs lie between 0.5–2.1:1, due to uncertainties in identifying cumulate eucrite. Gravity mapping of Vesta by the Dawn spacecraft supports the existence of diogenite plutons in the crust. Quantifying the proportion of high-density diogenitic crust in the gravity map yields I:E ratios of 0.8-1:2:1, values which are bracketed by calculations based on HEDs. The I:E ratio for Vesta is lower than for Earth and Mars, consistent with physical modeling of asteroid-size bodies. Nevertheless, it indicates a significant role for pluton emplacement during the formation of Vesta’s crust. These results are inconsistent with simple differentiation models that produce the crust by crystallization of a global magma ocean, unless residual melts are extracted into crustal magma chambers.

量化维斯塔地壳中各种火成岩的数量，就可以估算出描述小行星的全球分化和随后的岩浆史的岩石学比率。真玉岩：方铁矿（Euc：Diog）的比值衡量了铁镁质和超镁铁质成分的相对比例。侵入：挤压（I：E）比评估岩浆上升和喷发的有效性。我们通过计算世界陨石集合中的真绿岩，累计的真绿岩和重辉石的数量和质量，并使用化学混合图和多个薄层的岩石学制图计算它们作为地壳多角砾角砾岩（白云母）的成分的比例，来估算这些比率。后两种方法的Euc：Diog比率约为2：1，尽管陨石的数量和质量的比率稍高。根据黎明航天器仪器（VIR和GRaND）的光谱汇编的表面岩性图得出Euc：Diog比率，该比率包围了陨石对Euc：Diog的估计。由于确定累积的真玉矿的不确定性，HED的I：E比率在0.5-2.1：1之间。黎明号航天器对维斯塔的重力作图支持了地壳中重生物岩体的存在。量化重力图中高密度生源地壳的比例可得出I：E比率为0.8-1：2：1，这些值通过基于HED的计算括在括号中。Vesta的I：E比率低于地球和火星，这与小行星大小的物体的物理模型一致。然而，这表明在维斯塔地壳的形成过程中，对质子的定位起着重要作用。